Bent on being still attached to clique (4,3)
I believe the answer is:
dead set
'bent on' is the definition.
(both can mean determined)
'still attached to clique' is the wordplay.
'still' becomes 'dead' (synonyms).
'attached to' means one lot of letters go next to another.
'clique' becomes 'set' (I've seen this before).
'dead'+'set'='DEAD-SET'
'being' is the link.
(Other definitions for dead set that I've seen before include "Determined (upon)" , "Fully determined" , "Fixed in one's purpose" , "Absolutely determined, bent on" , "A determined attack, sounds moribund" .)