Body part ’urt (3)
I believe the answer is:
arm
This clue is a double definition.
'body part' is the first definition.
(arm is a kind of body part)
''urt' is the second definition.
('harm' - synonyms - said with the 'H' dropped, a cockney accent, like 'hurt' was)
(Other definitions for arm that I've seen before include "Limb; weapon" , "Supply weapons" , "What soldiers do" , "Authority" , "ready for war" .)