ACROSS
1A - At first, local usher nudges and clouts you for crazy behaviour (6)
4A - Salt residue next to container (6)
8A - Law of Japanese entertainer (2,1,4)
9A - In south Indian college, really ordinary (at first?) method of producing babies (2,5)
11A - A woman’s promise could be a weapon? (10)
12A - Princess and accountant returned for some vinegar, perhaps? (4)
13A - Miasma dispels morning sickness with a bit of wet sage (5)
14A - Device for Royal Engineer's sibling, reportedly (8)
16A - NITTFEST RG? That's the judicial code! (5,3)
18A - Irate monger declines second trade from dwarf (5)
20A - Thumb hidden by Eskimo (4)
21A - Casual ants mutilated old man (5,5)
23A - Neon with Uranium, Thorium & Radium initially form part of the core (7)
24A - Forge pot inside (7)
25A - Powder queen with brush (6)
26A - Biological sequence - add drug to #18. (6)
DOWN
1D - Bright light in city for knight (5)
2D - Heavenly band? (7)
3D - Anyhow, C’est la vie; without some vices, life's basically divine (9)
5D - Scream of pain that Stark had (5)
6D - Man! Lisa abused those creatures! (7)
7D - Beef from this, but no beef for this type! (9)
10D - Half of Windsor is travelling by boat in grief (9)
13D - The result of an inked cyst explosion (6,3)
15D - Characteristic styling of stage ruined when Edward's not there (9)
17D - Patients at home have sex with sodomists initially (7)
19D - City gate leads to abode of love (7)
21D - Shopkeep (5)
22D - Some fun clever relative (5)
Solutions:
ACROSS
1A - Local Usher Nudges And Clouts You (Acrostic)
4A - POT ASH
8A - ASA RULE
9A - IN VIT RO
11A - BROADS WORD
12A - DICA <-
13A - (miasma-am+w)*
14A - RE + HP of Sister
16A - Double definition
18A - (monger-r)* (From tRade)
20A - eSKIMo
21A - (casual ants)*
23A - NE(UTR)ON (UTR obtained as acrostic)
25A - DUST ER
26A - G(E)NOME
DOWN
1D - LA SER
2D - Cryptic def
3D - (c'est la vie-v+l)*
5D - OW NED
6D - (ManLisa)*
7D - Cryptic def
10D - windSOR ROWING
13D - (inkedcyst)*
15D - (stage ruined - ed)*
17D - IN MATE S
19D - OR LAND O
21D - Double definition
22D - fUN CLEver
