Implement used on farm to topple branch (9)
I believe the answer is:
pitchfork
'implement used on farm' is the definition.
(a farmer might use a pitchfork)
'topple branch' is the wordplay.
'topple' becomes 'pitch' (pitch can mean to fall over or tumble).
'branch' becomes 'fork' (synonyms).
'pitch'+'fork'='PITCHFORK'
'to' is the link.
(Other definitions for pitchfork that I've seen before include "Implement for tossing hay" , "Thrust into a difficult situation" , "multi-pronged tool" , "thrust into position" , "Tool for shifting hay" .)