Fool buries male remains (5)
I believe the answer is:
ashes
'remains' is the definition.
(I've seen this in another clue)
'fool buries male' is the wordplay.
'fool' becomes 'ass' (both can mean a stupid person).
'buries' means one lot of letters goes inside another.
'male' becomes 'he' (he refers to a man).
'ass' enclosing 'he' is 'ASHES'.
(Other definitions for ashes that I've seen before include "International competition" , "trees" , "Former Wimbledon champion's" , "Test-match trophy" , "sports contest" .)