S & B Cambridge – puzzle by Alchemi

OK, one more then!  Especially for the event, Alchemi (Independent/FT) wrote a celebratory crossword titled ‘Happy Birthday’. The PDF can be found here:  Alchemi @ Cambridge  . It is also possible to solve this puzzle interactively by clicking here.  Which is, by the way, a good excuse for visiting Alchemi’s excellent Alchemiland website!

No less than twelve solutions were surnames of more or less well-known people.  That is, apart from Fish (26d) whose real name is Derek William Dick.
They were all born on the 25th of April (as was Renee Zellweger but she’s not one of the twelve).
Their names are highlighted in the blog below.

Definitions are underlined wherever possible and/or appropriate.

Across
1 CALLOW
Inexperienced about everything that hurts (6)

C (about) + ALL (everything) + OW (that hurts)

4 CROMWELL
Civil War general‘s battery keeping Maryland’s capital in line (8)

CELL (battery) around {M[aryland] inside ROW (line)}

Oliver Cromwell (1599-1658)

10 ULVAEUS
Member of Abba poor value, essentially disgusting (7)

(VALUE)* + [disg]US[ting]    [* = poor]

Bjorn Ulvaeus (b. 1945)

11 BRISTOW
Corrupt payments half put away by darts player (7)

BRI[bes] (corrupt payments, half) + STOW (put away)

Eric Bristow (b. 1957)

12 FITZGERALD
Dead singer‘s glitz fared badly (10)

(GLITZ FARED)*    [* = badly]

Ella Fitzgerald (1917-1996)

13 UNDO
In the end, you again had to back out (4)

Last letters (‘in the end’) of:   [yo]U [agai]N [ha]D [t]O

15 SKIERS
Captains not quiet at all as they go downhill (6)

SKIPPERS (captains) with no P (quiet) at all

16 AMASSED
Collected a fool in the sea (7)

A + {ASS (fool) inside MED (the sea)}

19 PANESAR
England cricketer‘s glass sheets are cut (7)

PANES (glass sheets) + AR[e]

Monty Panesar (b. 1982)

21 MURROW
Dead US journalist rebuffing strange argument (6)

MUR (reversal (‘rebuffing’) of RUM (strange)) + ROW (argument)

Edward R. Murrow (1908-1965)

23 EMMY
Gracious after setter returns award (4)

MY (gracious!) coming after EM (reversal (‘returns’) of ME (setter))

25 OPHTHALMIA
Procedure that cheaply (if only occasionally) reaches target: reversing conjunctivitis (10)

OP (procedure) + ‘occasional’ choice of:  [t]H[a]T [c]H[e]A[p]L[y] + MIA (reversal (‘reversing’) of AIM (target))

27 DESKILL
Office furniture this person will make less demanding (7)

DESK (office furniture) + I’LL (this person will)

28 MARCONI
Return stuff about India’s dead Nobel laureate (7)

MARC (reversal (‘return’) of CRAM (stuff)) + ON (about) + I (India, think: NATO alphabet)

Guglielmo Marconi (1874-1937)

29 DEATH BED
The last place you would expect to find someone who headed BT badly (8)

(HEADED BT)*    [* = badly]

30 UDERZO
Australian wine posh? The reverse, according to Asterix’s creator (6)

Reversal (‘the reverse’) of:    OZ (Australian) + RED (wine) + U (posh)

Albert Uderzo (b. 1927)

Down
1 CRUYFF
See bird swallowing unknown ex-footballer (6)

C (see, the letter) + {RUFF (bird) around Y (unknown)}

Johan Cruijff (b. 1947)

2 LOVE-TOKEN
Look at ban on Livingstone, say, as an earnest of intent (4-5)

LO (look) + VETO (ban) + KEN (Livingstone, say)

3 OVER-GREASY
Having too much fat – method of cooking eggs in the US contains grammes (4-6)

OVER EASY (method of cooking eggs, in the US) around GR (grammes)

5 RUBELLA
Polish 12 has a complaint (7)

RUB (polish) + ELLA (12, i.e. 12ac = Fitzgerald)

6 MAIL
Armour which gets delivered most days (4)

Double definition

7 EATEN
Geordie cheers up after last of ale is consumed (5)

 ATEN (reversal (‘up’) of NE (Geordie) + TA (cheers)) coming after [al]E

8 LAW LORDS
Senior judges heard everyone in cricket ground (3,5)

AWL (homophone (‘heard’) of ALL (everyone)) inside LORDS (cricket ground)

9 OSIRIS
God therefore put up flag (6)

OS (reversal (‘put up’) of SO (therefore)) + IRIS (flag)

14 FAIR-HAIRED
Blonde tortoise opponent did, according to Spooner (4-6)

Spoonerism of:    HARE (tortoise opponent) FARED (did)

17 STORM DOOR
Southerly heading for Marines’ party essentially more protection against bad weather (5,4)

S (southerly) + TO (heading for) + RM (Marines, the Royal ones) + DO (party) + [m]OR[e]

18 SPLENDID
Magnificent organ missed first note, then was satisfactory (8)

{SPLEEN (organ) minus the first E (note)} + DID (was satisfactory)

20 REPULSE
Be disgusting about Bean (7)

RE (about) + BEAN (pulse)

21 ME TIME
Private self-indulgence for actor in silent film? The opposite! (2,4)

ET (film) inside MIME (silent actor), instead of the other way around

22 PACINO
Harmonica player captivates rising actor (6)

Hidden solution (‘captivates’):    [harm]ONICA P[layer],  then reversed (‘climbing’)

Al Pacino (b. 1940)

24 MASSA
Car racer masters when to climb (5)

MAS (masters, plural of MA) + SA (reversal (‘to climb’) of AS (when))

Felipe Massa (b. 1981)

26 FISH
Singer one between loud and silent (4)

I (one) between F (loud) and SH (silent)

Fish, ex-Marillion (b. 1958)

*anagram