Plump person regularly feasts on turkey, apart from innards (5)
I believe the answer is:
fatty
'plump person' is the definition.
(unkind term for a fat person)
'regularly feasts on turkey apart from innards' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'on' is a charade indicator (letters next to each other).
'apart from innards' suggests removing the centre (the letters inside the word are removed).
'turkey' with its middle removed is 'ty'.
The alternating letters of 'feasts' are 'fat'.
'fat'+'ty'='FATTY'
(Other definitions for fatty that I've seen before include "One overlarge" , "Not lean" , "Tissue that's adipose" .)