French officer spread marge, eating leftover (8)
I believe the answer is:
gendarme
'french officer' is the definition.
(I've seen this in another clue)
'spread marge eating leftover' is the wordplay.
'spread' indicates anagramming the letters.
'eating' is an insertion indicator.
'leftover' becomes 'end' (I've seen this in another clue).
'marge' is an anagram of 'garme'.
'garme' placed around 'end' is 'GENDARME'.
(Other definitions for gendarme that I've seen before include "French Connection cop" , "policeman in Paris?" , "Nice policeman" , "Soldier on police duty" , "alpine pinnacle" .)