Last part, rear (4,3)
I believe the answer is:
tail end
I believe this clue is a double definition.
'last part' is the first definition.
(I've seen this in another clue)
'rear' is the second definition.
(synonyms)
(Other definitions for tail end that I've seen before include "Very last part" , "like late Charlie?" , "Hindmost part" , "Back" , "Last batsmen" .)