Naughty wife chose to go topless (6)
I believe the answer is:
wicked
'naughty' is the definition.
(thesaurus)
'wife chose to go topless' is the wordplay.
'wife' becomes 'w'.
'chose' becomes 'picked' (picking is a kind of choosing).
'to go topless' means to remove the first letter.
'picked' with its initial letter taken off is 'icked'.
'w'+'icked'='WICKED'
(Other definitions for wicked that I've seen before include "Ungodly; excellent (sl.)" , "Very bad, or very good nowadays" , "Absorbed in enchanting" , "Evil or morally wrong" , "Sinful" .)