Unattached miss holding ring (5)
I believe the answer is:
loose
'unattached' is the definition.
(thesaurus)
'miss holding ring' is the wordplay.
'miss' becomes 'lose' (I've seen this in other clues).
'holding' means one lot of letters goes inside another.
'ring' becomes 'o'.
'lose' going around 'o' is 'LOOSE'.
(Other definitions for loose that I've seen before include "Free or immoral" , "Unconfined" , "Not strict" , "poor fit?" , "Not secured" .)