Mend part of sock for the listener? (4)
I believe the answer is:
heal
'mend' is the definition.
('heal' can be a synonym of 'mend')
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for heal that I've seen before include "Make whole and healthy" , "Cure, make well" , "Get healthy again" , "Get well again" , "Of wound, mend and get better" .)