Radio buff (3)
I believe the answer is:
ham
'radio buff' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ham that I've seen before include "Bad actor; Noah son" , "A poor actor - overdoes it" , "(Cooked or cured) thigh of pig" , "An actor who overdoes it in meaty way" , "Cured pig's meat" .)