Radio Times 31

[Saint76]

Stuck on a few today. Any help greatly appreciated. x
12a A sincerely odd cover for tiny TV actress ?l?I?e ???e???
5d Swears to cook fish ??????
6d Huge expanse once transformed outside area ?????
18d Quickly go round leaky ends of sea creature ?????
thanks x

[Lie-in King]

12a Claire Sweeney - anag 'a sincerely' (round) 'wee' (tiny)
5d Wrasse - anag 'swears'
6d Ocean - anag 'once' (outside) 'a(rea)'
18d Polyp - 'pop' (quickly go, round) 'l(eak)y' (ends)

[kettledrum]

6d ocean

[Saint76]

thanks xx