Stuck-up doctor eating egg I cooked (6)
I believe the answer is:
rigged
'cooked' is the definition.
(both can mean forged or manipulated)
'stuck-up doctor eating egg i' is the wordplay.
'stuck up' is a reversal indicator.
'doctor' becomes 'dr' (abbreviation).
'eating' is an insertion indicator.
'egg'+'i'='eggi'
'dr' going around 'eggi' is 'deggir'.
'deggir' backwards is 'RIGGED'.
(Other definitions for rigged that I've seen before include "Managed fraudulently - a tallship?" , "Fraudulently fixed" , "Set up fraudulently" , "Manipulated by digger" , "Corruptly manipulated" .)