Sunday Post Cryptic

[grumpee]

9a deeply affecting cavaliers without a twist (8) V ? S ? R ? A ?
13d alien boy eats first of adults (7) M ? S ? ? ?
20 a is gain in place of MArk (8) ? N ? ? ? N ? A

thanks

[JJ109]

20 insignia

[cashier]

18. Martian. Marti(a)n

[Lie-in King]

9a Visceral - anag 'c(a)valiers' (without 'a')
13d Martian - 'Martin' (boy, eats) 'a(dults)' (first)
20a Insignia - anag 'is gain in'

[aelmpvw]

9a visceral

[mac44]

9a. visceral

[dannyk13]

Visceral - anagram of C(a)valiers

[grumpee]

thanks all :0)