Doctor avoids bad corn and meat (5)
I believe the answer is:
bacon
'meat' is the definition.
(bacon is a kind of meat)
'doctor avoids bad corn' is the wordplay.
'doctor' becomes 'Dr' (abbreviation).
'avoids' indicates named letters should be taken away.
'bad'+'corn'='badcorn'
'badcorn' with 'dr' removed is 'BACON'.
'and' is the link.
(Other definitions for bacon that I've seen before include "Meat in rashers" , "Writer of essays" , "Francis or Roger?" , "Irish-born painter" , "Francis ---, Ir. painter" .)