Doctor shed tears over breast (5)
I believe the answer is:
bosom
'breast' is the definition.
(bosom is a kind of breast)
'doctor shed tears over' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'shed tears' becomes 'sob'.
'over' says the letters should be written backwards.
'mo'+'sob'='mosob'
'mosob' reversed gives 'BOSOM'.
(Other definitions for bosom that I've seen before include "Woman's breast" , "(Female's) chest" , "Embrace" , "5 [BUST]" , "Woman's chest" .)