I found this rather easy by Beelzebub standards because there were many straightforward clues to common words and even the more obscure entries were readily determined from the clear and simple wordplay.
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Across
1 Dance with wife standing in for husband inclined to dizziness (6)
SWIMMY – ShIMMY (dance) with W (wife) replacing (standing in for) H (husband)
7 Tree’s outgrowth, round mass (4)
AMLA – ALA (outgrowth) round M (mass)
10 Exhausted by grief over sheep, in conflict, that is dead (3-7)
WOE-WEARIED – O (over) EWE (sheep) in WAR (conflict) IE (that is) D (dead)
11 Tiring more, so struggling for revival (12)
RISORGIMENTO – an anagram (struggling) of TIRING MORE SO
13 Larger return a quantity of work brought about (7)
GREATER – RET (return) A ERG (quantity of work) reversed (brought about)
15 Second look gave away drunk (7)
SLOSHED – S (second) LO (look) SHED (gave away)
16 Agile scout stopped by river (4)
SPRY – SPY (scout) around (stopped by) R (river)
18 Coy, awkwardly admitting hollow interest (6)
OCCUPY – an anagram (awkwardly) of COY around (admitting) CUP (hollow)
19 Poisonous substance alight inside volcanic hill (6)
CONINE – IN (alight) inside CONE (volcanic hill)
20 Titan short of time, sadly (4)
ALAS – A[t]LAS (Titan short of time)
24 Hit by bias, getting licking (7)
LAMBENT – LAM (hit) BENT (bias)
25 Old Testament writer hostile to change (7)
ELOHIST – an anagram (to change) of HOSTILE
27 Watercolourist in torment round French resort with no end of pigeons (12)
PERISTERONIC – RI (watercolourist) in PESTER (torment) plus O (round) NIC[e] (French resort with no end)
28 Heater damaged by attack near that place (10)
THEREABOUT – an anagram (damaged of HEATER plus BOUT (attack)
29 Predatory dealer wanting first go (4)
HARK – [s]HARK (predatory dealer wanting first)
30 Shut up for example with skin disease returning (6)
ENCAGE – EG (for example) ACNE (skin disease) reversed (returning)
Down
1 Pressure that’s dreadful rests on head of state (6)
STRESS – an anagram (dreadful) of RESTS plus S[tate] (head of state)
2 King left bound by defeat, office overthrown in vortex (9)
WHIRLPOOL – R (king) L (left) in (bound by) WHIP (defeat) plus LOO (office) reversed (overthrown)
3 Form of verb in sentence coming up (4)
MOOD – DOOM (sentence) reversed (coming up)
4 Supplier’s hesitation about pledge enclosed by cheapskate (12)
MERCHANDISER – ER (hesitation) C (about) HAND (pledge) in (enclosed by) MISER (cheapskate)
5 Crowd around one going over mantra in succession (7)
HEIRDOM – HERD (crowd) around I (one) OM (mantra)
6 Director in difficulty with swindler losing money during long period (5,7)
JAMES CAMERON – JAM (difficulty) plus SCAM[m]ER (swindler losing money) in (during) EON (long period)
7 Declare old district deserted (5)
AREAD – AREA (district) D (deserted)
8 Drink in power after tense month mostly in charge (4,5)
MINT JULEP – T (tense) JUL[y] (month mostly) in MINE (charge) plus P (power)
9 Trouble relating to worship (5)
ADORE – ADO (trouble) RE (relating to)
12 Nook occupied by black and yellow moth (9)
CORNBORER – CORNER (nook) around (occupied by) B (black) OR (yellow)
14 Cross old man in conclusion becoming communicative (9)
EXPANDING – X (cross) PA (old man) in ENDING (conclusion)
17 Satellite’s temperature above ground alters (7)
TELSTAR – T (temperature) plus an anagram (ground) of ALTERS
21 Spice initially crumbly in condition (6)
STACTE – C[rumbly] (initially crumbly) in STATE (condition)
22 Profundity in thought pedant raised (5)
DEPTH – hidden reversal in ‘thougHT PEDant’
23 Quiet and weary, avoid work (5)
SHIRK – SH (quiet) IRK (weary)
26 Monkey caught after act for all to see (4)
DOUC – DO (act) U (for all to see) C (caught)
Agree about it being a straightforward one, Gaufrid, but it was elegant and by no means without humour. I like the fact that colloquialisms and simple words are intermixed with more obscure ones. So Beelzebub, whichever one of you it was, muchas gracias.