Chap informally cooking tubers (6)
I believe the answer is:
buster
'chap informally' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'cooking tubers' is the wordplay.
'cooking' indicates an anagram.
'tubers' anagrammed gives 'BUSTER'.
Can you help me to learn more?
(Other definitions for buster that I've seen before include "- - Keaton, silent star" , "-- Keaton, comic actor" , "-- Keaton, US silent film actor" , "Keaton or Crabbe" , "Form of address to man" .)