The elephant holds foot part (4)
I believe the answer is:
heel
'foot part' is the definition.
(I know that heel is part of foot)
'the elephant holds' is the wordplay.
'holds' says the answer is hidden in the clue.
'HEEL' is hidden within 'the elephant'.
(Other definitions for heel that I've seen before include "One of the crusty ends of a loaf" , "secure ball" , "Back of 15 across" , "Contemptible person" , "Spur" .)