I enjoyed this one, my only gripe being that it was over far too quickly. One thing that struck me, particularly whilst writing this post, was the smoothness and relevance of some of the clues, for example 9ac and 3dn to mention just two.
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Across
1 Omitting nothing, laborious artist creates ornamental monogram (6)
TUGHRA – T[o]UGH (omitting nothing, laborious) RA (artist)
5 Making godlike supposition in playing dice (6)
DEIFIC – IF (supposition) in an anagram (playing) of DICE
9 Rector with faith wanting bishop’s assistance (6)
RELIEF – R (Rector) [b]ELIEF (faith wanting bishop)
10 Part of jellyfish in bad incident coming about (5)
CNIDA – hidden reversal (in … coming about) in ‘bAD INCident’
13 Notice a small contribution for one with nothing on? (7)
ADAMITE – AD (notice) A MITE (a small contribution)
14 Compromise position in returning tax, unclear and approximate (6,6)
MIDDLE GROUND – GELD (tax) DIM (unclear) reversed (returning) ROUND (approximate)
15 European in scheme certainly not for Californian citizen (8)
ANGELENO – E (European) in ANGLE (scheme) NO (certainly not)
16 Learn about oars arranged in layers (7)
SEROSAE – SEE (learn) around (about) an anagram (arranged) of OARS
18 Galleon from Cuba on the alert (7)
CARRECT – C (Cuba) ARRECT (on the alert)
23 Note aim altered by absolute repentance (8)
METANOIA – an anagram (altered) of NOTE AIM plus A (absolute)
24 Determined forward, one with talent keeping endlessly keen (12)
PERTINACIOUS – PERT (forward) I (one) NOUS (talent) around (keeping) ACI[d] (endlessly keen)
25 Ecstatic about tenor, completely astounded (7)
STUPENT – SENT (ecstatic) around (about) T (tenor) UP (completely)
26 Old-fashioned anger harboured by desperate enemy (5)
TEENE – hidden in (harboured by) ‘desperaTE ENEmy’
27 Funny taste finally in pear (6)
COMICE – COMIC (funny) [tast]E (taste finally)
28 Unrefined, unknown man in revolution full of cunning (6)
EARTHY – Y (unknown) HE (man) reversed (in revolution) around (full of) ART (cunning)
29 Renegade in panic abandoned by a comrade (6)
FRATER – RAT (renegade) in FE[a]R (panic abandoned by a)
Down
1 American writer’s odd article about power held by bear (6,6)
TRUMAN CAPOTE – RUM (odd) AN (article) CA (about) P (power) in (held by) TOTE (bear)
2 Good line on border getting knowing look in Scotland (6)
GLEDGE – G (good) L (line) EDGE (border)
3 Knight breaking cover with king in check (6)
HINDER – N (knight) in (breaking) HIDE (cover) plus R (king)
4 True story in old form again (7)
REALLIE – REAL (true) LIE (story)
5 Keep getting upset about banter in search by police (7)
DRAGNET – TEND (keep) reversed (getting upset) around (about) RAG (banter)
6 Protuberance from wing free of pressure (5)
INION – [p]INION (wing free of pressure)
7 Loud appeal on purpose ignoring odd features in false charges (3-3)
FIT-UPS – F (loud) IT (appeal) [p]U[r]P[o]S[e] (purpose ignoring odd features)
8 One studying late rule appended to laws enacted in error (6-6)
CANDLE-WASTER – an anagram (in error) of LAWS ENACTED plus R (rule)
11 Bulbous plant, not large, under hollow shell (9)
DENTALIUM – DENT (hollow) AL[l]IUM (bulbous plant, not large)
12 Language that’s alien she’s translated (9)
SINHALESE – an anagram (translated) of ALIEN SHE’S
16 Poet’s evening consumed by prayer after sun’s setting (7)
SCENERY – S (sun) plus ENE (poet’s evening) in (consumed by) CRY (prayer)
17 Nuclear device in range, hour away, on hill (7)
REACTOR – REAC[h] (range, hour away) TOR (hill)
19 Recreating the past, take up being spiv (6)
RORTER – RETRO (recreating the past) R (take) reversed (up)
20 Cipher cracked in game (6)
ENIGMA – an anagram (cracked) of IN GAME
21 Calm down and murmur softly, given illumination (4,2)
COOL IT – COO (murmur softly) LIT (given illumination)
22 Exploit shock therapy initially (5)
STUNT – STUN (shock) T[herapy] (therapy initially)
I quite agree with all your sentiments Gaufrid. Proper vintage Beelzebub.
Off to tackle this week’s now.
I have the completed grid in front of me but there are no notes on it, only a couple of anagram workings-out, so I guess it went in easily, but I have no memory of doing this.