Unattached ladies and gents couple finally (5)
I believe the answer is:
loose
'unattached' is the definition.
(thesaurus)
'ladies and gents couple finally' is the wordplay.
'ladies and gents' becomes 'loos'.
'finally' says to take the final letters.
The final letter of 'couple' is 'e'.
'loos'+'e'='LOOSE'
(Other definitions for loose that I've seen before include "Unattached" , "Not strict" , "Not fixed; inexact" , "Water heater" , "(Of a garment) a size too big?" .)