A guy can get attached to her (3)
I believe the answer is:
peg
'her' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for peg that I've seen before include "The woman" , "Fix (a price)" , "This leg is artificial" , "The girl to hang your hat on" , "Member" .)