Ft 13,855

[saladdodger]

1a Punch gets supporter to change sides P?E?C?
20d Yarn, we hear, devoid of pity ?R???L argyll possibly but why?
The y may come from:
25a Bird is going to city centre devouring anything - think it's yellow tit or willow tit (owt = anything , it cITy centre)
6d Lying about rock star R?S?I?G must be resting but not sure why?

Thanks for any help and/or explanations

[Euphemia]

6d Re Sting

[atrollope]

amoral

[Ouzel]

6d Re sting

[Lie-in King]

1a Pierce - 'pier' (supporter) + c(hang)e (sides [of])
20d Crewel - "cruel"
25a Willow tit - 'owt' (anything, in) 'will' (is going) + (c)it(y) (centre)

[saladdodger]

Thank you euphemia, atrollope, ouzel & lie-in king for help & explanations.