Lounges not opening for louts (4)
I believe the answer is:
oafs
'for louts' is the definition.
('oaf' can be a synonym of 'lout')
'lounges not opening' is the wordplay.
'lounges' becomes 'loafs' ('loaf' can be a synonym of 'lounge').
'not opening' means to remove the first letter (the opening letter is removed).
'loafs' with its initial letter removed is 'OAFS'.
(Other definitions for oafs that I've seen before include "Louts, lummoxes" , "Dolts" , "Boors or buffoons" , "Uncouth buffoons" , "fools?" .)