Only said he's an object of ridicule (4)
I believe the answer is:
butt
'an object of ridicule' is the definition.
(I've seen this before)
'only said' is the wordplay.
'only' becomes 'but' (I've seen this before).
'said' becomes 't' (I've seen this in other clues).
'but'+'t'='BUTT'
'he's' is the link.
This may not be correct. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for butt that I've seen before include "Push with the head" , "one ridiculed" , "Hit with the head; object of ridicule" , "What goat may do" , "ram > end" .)