Heart perhaps in rogue broken by lover, finally (4)
I believe the answer is:
card
'heart perhaps' is the definition.
(heart is a kind of card)
'rogue broken by lover finally' is the wordplay.
'rogue' becomes 'cad' (I've seen this before**).
'broken by' is an insertion indicator.
'finally' says to take the final letters.
The last letter of 'lover' is 'r'.
'cad' going around 'r' is 'CARD'.
'in' is the link.
(Other definitions for card that I've seen before include "Something (usually) folded with a special message" , "Something players try to avoid" , "Birthday greeting" , "Stiff paper; comb" , "showing heart, say" .)