Beelzebub 1,350 – Fifteensquared

Just the one thing that I can’t quite see, at 33 across.

*=anagram, []=dropped, <=reversed. Hover to expand abbreviations.

Across
4	VULSELLAE – (L + L) in (LEAVE US)*.
11	ERNANI – AN in (IN RE)<.
12	UNDER – [bl]UNDER.
13	TAYRA – Y in TARA.
14	NEAP – A in PEN<.
15	AWHILE – HIL[l] in AWE.
16	VIEWLY – VIE + W[i]LY.
17	BLOCK RELEASE – (LOCK + RELE[t]) in BASE.
18	ROWENA – (A + NEW + OR)<. Lady Rowena, from Scott’s Ivanhoe.
23	LAOGAI – GOAL< + A + I.
25	WILD WILLIAMS – sort of a reverse anagram, as (I + SAWMILL)*.
27	SEAMAS – from SEAMAN, changing N to S. Stokes is “the CGS unit of kinematic viscosity”.
28	ALL-RED – ALL[u]RED.
30	INGO – [l]INGO.
31	CIRRI – C + [a]IR + [a]IR<.
32	COATI – COATI[ng].
33	CASEIN – Protein having point for example.
34	GYNAECEUM – (CUE GAY MEN)*.

Down
1	BETA – BET + A.
2	WRAWL – W + RAW + [yow]L. From Spenser, hence “in verse”.
3	ANYHOW – (NY + HO) in AW.
4	VARICES – C in VARIES.
5	LIBERALISTIC – L[iberal] + (IE T BLAIR IS)* + C[onservative].
6	SURVEILLANCE – (NUCLEAR EVILS)*.
7	ENSILE – [t]ENSILE.
8	LEEWAY – WEE< in LAY.
9	ARAL SEA – ALS[o] in AREA.
10	EMPYESIS – EMP + YES + IS.
17	BROWSING – BROW + SING.
19	ORIENCY – (RICE ON) + [cole]Y.
20	ZOILISM – OZ< + (I SLIM)*.
21	FLAGON – FLAG ON.
22	TWAITE – IT in TWAE.
24	GARRET – (A in GR) + RET[e].
26	MERIT – M + TIRE<.
29	DING – D ING, as in Doctor of Engineering.