I found this quite a slog. It had some very tough clues and occasionally quite obscure references.
There seems to be a Patti Smith theme. Apart from the two which directly reference her, I think Gloria and Land are also references to her work. There are probably others but she's not an artist I know much about.

| ACROSS | ||
| 1 | SCRIBE |
Writer in bed overwhelmed by endless lovemaking (6)
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Crib(=bed) in se[x](=lovemaking) |
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| 4 | SALLOWER |
Everything screened by broadcaster is more jaundiced (8)
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All in sower(=broadcaster of seeds) |
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| 10 | OFF BREAKS |
Deliveries cancelled before holidays (3,6)
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Off(=cancelled) + breaks(=holidays). An off-break is a spin delivery in cricket. |
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| 11 |
See 15
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| 12 | LAND |
Secure country (4)
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DD. The first def would be in the sense of "I've secured/landed a prize". |
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| 13 | REINSTATES |
Gallery on board after controller returns to former position (10)
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(Tate(=gallery in London and other cities) in SS(=onboard i.e. inside a steamship)) after rein(=controller in the sense of the rein used for a horse) |
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| 15/11 | REDONDO BEACH |
Bum echoed Brando somewhere close to Los Angeles (7,5)
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(Echoed Brando)* |
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| 16 | HORSES |
Animals record released 50 years ago (6)
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DD referring to the Patti Smith album Horses, which was released on the 10th November 1975. |
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| 19 | GLORIA |
Tissue-wrapped gold halo (6)
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Glia(=tissue, a type of cell in the brain and spinal cord also called neuroglia) around or(=golden in heraldic usage) |
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| 21 | CLOSE TO |
Secret love is nearby (5,2)
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Closet(=secret, as in "her closet admirer") + o(=love) |
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| 23 | PATTI SMITH |
Singer and model coming back with German opening track (5,5)
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(Sit<(=model) + mit(=German for "with")) in(=opening) path(=track) |
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| 25 | KITE |
3 characters reflected in strange TikToks (4)
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Hidden, reversed in strange tiktoks |
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| 27 | IBIZA |
Cabaret singer loses face covering AC/DC in rave venue (5)
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[L]iza(=Minelli, who appeared in the film version of Cabaret) around bi(=AC/DC as a slang term for bisexual) |
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| 28 | REFORMISM |
Political doctrine on the subject of class is principle of Marxism (9)
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Re(=on subject of) + form(=class when used in things like "fourth form") + is + M[arxism] |
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| 29/7 | KIMBERLY WYATT |
Mike Batt wryly remixed Pussycat Doll (8,5)
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(Mike Batt wryly)*. Kimberley Wyatt was a member of the girl group The Pussycat Dolls, |
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| 30 | REAGAN |
Royal daughter hosting a president (6)
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Regan(=one of the daughters of King Lear) around a |
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| DOWN | ||
| 1 | SPOILERS |
They try to stop drag queen stuffing booty (8)
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ER(=late queen) in spoils(=booty, as in "spoils of war") |
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| 2 | RAFA NADAL |
Racketeer pilots a new car in reverse (4,5)
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RAF(=pilots, although this is questionable since the RAF has ground crew, engineers etc as well) + a n{ew} + Lada<(=make of car). The definition is a somewhat whimsical reference to Nadal using a racket while playing tennis. |
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| 3 | BIRD |
Amount offered to kidnap right-winger (4)
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Bid(=amount offered at an auction) around r{ight} |
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| 5 | ABSINTH |
Ban this awful drink (7)
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(Ban this)*. The word is normally spelt with an E at the end but this seems to be an acceptable alternative. |
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| 6 | LOBSTER POT |
Behold Harry Potter crushing rubbish basket (7,3)
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(Lo(=behold) + potter*)(harry used as the anagram indicator) around b{ull} s{h*t}(=rubbish) |
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| 7 |
See 29 Across
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| 8 | REHASH |
Soldiers’ mess showing The Magnificent Seven perhaps (6)
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RE(=Royal Engineers) + hash(=mess). The Magnificent Seven was a rehash of the Japanese film Seven Samurai. |
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| 9 | GAZEBO |
Happy Monday afternoon coming up in wee outhouse (6)
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(Bez(=Happy Mondays band member) + a{fternoon})< in go(=wee as in urinate) |
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| 14 | INORDINATE |
Excessive noise worried uninitiated child at first (10)
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(Din(=noise) + ate(=worried)) after [m]inor |
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| 17 | ELEGISING |
Nigel in Reform welcomes unusual form of protection delivering sorrowful lines (9)
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Nigel* around egis, which is an unusual spelling of the word aegis(=protection). |
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| 18 | MONEYMAN |
Financier contracted Brazilian footballer within a day (8)
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Neyma{r} in Mon{day} |
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| 20 | ADMIRAL |
One commanding batsman going up over mid-off (7)
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Lara<(=Brian Lara, West Indian batsman) around mid* |
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| 21 | CUT OFF |
Stop cat spending month inside box (3,3)
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Seems to be to{m} in cuff(=box). Spending is used as the removal indicator to take m{onth} from tom. I think box is used as a synonym for cuff in the sense of a light blow (cuff someone/box their ears). |
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| 22 | UPTICK |
Happy over credit increase (6)
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Up(=happy) + tick(=credit, as in "on tick") |
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| 24 | TUISM |
Apostrophe is dividing corporation (5)
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Is in tum(=corporation). I'd never heard of tuism before but it is in Chambers as a synonym for apostrophe. |
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| 26 | FREE |
Independent bank promoting Head of Finance (4)
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Reef with F[inance] "promoted" to the front. |
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Thanks Grecian and NealH
This year sees the 50th anniversary of Patti Smith’s landmark album Horses.
The thematics include tracks from the album: Gloria, Land & BirdLand, Kimberly, Redondo Beach, Free Money & Elegie.