I think this was the toughest Beelzebub I can remember for some time, though I made it harder by entering one or two wrong answers early on. Even so it took a fair bit of research and/or cheating to fill the grid, let alone explain it all.
*=anag, []=dropped, <=reversed, hom=homophone, cd=cryptic definition, dd=double definition.
| Across | |
|---|---|
| 1 | OFFEND – OFF + END. |
| 5 | STODGE – ST[o]OD + EG<. |
| 9 | MILLISIEVERT – MILL + (EVER in I SIT). |
| 10 | BRANDY – R in BANDY. |
| 14 | PLEROMA – MOREL< in PA. |
| 15 | OMNIFY – O + NIF[t]Y. |
| 16 | MULL – dd. |
| 17 | PASTICCIO – C in (A TOPIC IS)*. |
| 20 | OCEANIDES – O[n]CE + (I in ANDES). |
| 22 | OYES – dd. |
| 23 | STRICT – STRI[p] + CT. |
| 25 | BEWITCH – WEB< + ITCH. |
| 27 | VIMANA – MAN in VIA. |
| 28 | SCOLOPENDRID – (OPEN in SCOLD) + RID. |
| 29 | CONINE – [ba]CON IN E[xperiment]. |
| 30 | DEVICE – DEVI[l] + CE. |
| Down | |
| 1 | OMBROPHOBE – [c]OMB + (HOB in ROPE). |
| 2 | FIREMAN – FIR + NAME<. |
| 3 | FLAWN – FLAW + N. |
| 4 | NIDIFICATION – IN< + (IDIOTIC FAN)*. |
| 5 | SIALIC – A in SILIC[on]. |
| 6 | TEREBINTHINE – E in (THE INNER BIT)*. |
| 7 | DEVOUT – ED< + V + OUT. |
| 8 | GRIM – G[ate] + RIM. |
| 11 | ARMOIRE – ((RM + 0) in AIR) + E. |
| 12 | BALUSTRADE – (AT BAD RULES)*. |
| 13 | MITOSIS – (IT in MO) + SIS. |
| 18 | MECONIC – (CO in MINE*) + C[orrosion]. |
| 19 | NEWTON – NEWT + ON. |
| 21 | ESCAPE – (S in [sel]EC[ted]) + APE. |
| 24 | IMARI – I MAR + I[nvaluable]. |
| 26 | ECCO – E[a]C[h] C[o]O[k]. |