Painter is tucking into baked tart (6)
I believe the answer is:
artist
'painter' is the definition.
(painter is an example)
'is tucking into baked tart' is the wordplay.
'tucking into' indicates putting letters inside.
'baked' indicates an anagram.
'tart' is an anagram of 'artt'.
'is' put inside 'artt' is 'ARTIST'.
(Other definitions for artist that I've seen before include "Skilled person" , "Model employer, perhaps" , "Painter in dire strait" , "Bacon, for example?" , "Creative individual" .)