Odd-job man caught poking tubby, round belly (8)
I believe the answer is:
factotum
'odd-job man' is the definition.
(a factotum does multiple kinds of work)
'caught poking tubby round belly' is the wordplay.
'caught' becomes 'ct'.
'poking' is an insertion indicator (poke can mean to create a hole in).
'tubby round' becomes 'fao' (I can't justify this - if you can you should believe this answer much more).
'belly' becomes 'tum' (I've seen this in another clue).
'ct' placed within 'fao' is 'facto'.
'facto'+'tum'='FACTOTUM'
(Other definitions for factotum that I've seen before include "Jack of all Trades" , "Versatile employee" , "One employed to do various jobs" , "Employee who does many jobs" , "Odd-job servant" .)