Dependent sweetheart suppressing fury (6-2)
I believe the answer is:
hanger-on
'dependent' is the definition.
(thesaurus)
'sweetheart suppressing fury' is the wordplay.
'sweetheart' becomes 'hon' (both are terms of endearment).
'suppressing' indicates putting letters inside.
'fury' becomes 'anger' (fury is intense anger).
'hon' enclosing 'anger' is 'HANGER-ON'.
(Other definitions for hanger-on that I've seen before include "Dependent - sycophantic follower" , "Social leech" , "An unwanted follower or dependant - swings out of you" , "A sycophant - he really clings" , "Persistent follower" .)