Resort trip a fiasco, I confess (3,1,4,3)
I believe the answer is:
its a fair cop
'i confess' is the definition.
'resort trip a fiasco' is the wordplay.
'resort' indicates anagramming the letters.
'trip'+'a'+'fiasco'='tripafiasco'
'tripafiasco' anagrammed gives 'ITS A FAIR COP'.
(Other definitions for its a fair cop that I've seen before include "blonde WPC?" , "Supposed felon's remark on being apprehended" , "Felon's comment when apprehended" , "Admission on being caught doing wrong" , "You've got me, officer!" .)