Part of foot to get better reportedly (4)
I believe the answer is:
heel
'part of foot' is the definition.
(I've seen this before)
'better reportedly' is the wordplay.
'better' becomes 'heal' (healing is a kind of bettering).
'reportedly' shows a homophone (sound like).
'heal' sounds like 'HEEL'.
'to get' acts as a link.
(Other definitions for heel that I've seen before include "American rotter or shoe part" , "Shoe part - come here, Fido!" , "Lean over; part of foot" , "A cad and a bounder!" , "Part of shoe; bad person" .)