Explanations:1A SNAKEGOD SNAKE(GO agony - any)D (kneads anagram)9A HAUL Hall homophone10A GATO Hidden11A ENSIGN (r)E(N)SIGN12A NOTMYJOB NO(TM(Y)J)OB (Bono anagram)13A ALIT Tail anagram14A GALL Gaul homophone15A NUNS FIrst letters of newly upgraded nation state18A EASE (l)EASE20A INCH Chin anagram22A WRIT Tire reversed, change E to W24A GARAGE GAR(B)AGE25A GONADAL Go Nadal26A NICEWORK N(IC)EW (y)ORK1D SHENANIGAN SHE N ANIGA (again anagram) N
2D NANO hidden3D AUSTIN Double definition4D KLIMT milk (reversed) + T5D EGGY (p)EGGY6D GANJA Hidden7D OTTO Alternate letters of forty two8D DOUBLETALK Double definition14D GEWGAW GE(WG)AW (wage anagram)16D UNAGI iguana anagram without a17D SHANE Hanes anagram19D SITAR S(I)TAR21D CROC C ROC(k)23D REDO RED O
2D NANO hidden 3D AUSTIN Double definition 4D KLIMT milk (reversed) + T 5D EGGY (p)EGGY 6D GANJA Hidden 7D OTTO Alternate letters of forty two 8D DOUBLETALK Double definition 14D GEWGAW GE(WG)AW (wage anagram) 16D UNAGI iguana anagram without a 17D SHANE Hanes anagram 19D SITAR S(I)TAR 21D CROC C ROC(k) 23D REDO RED O