Resent shift, say, ending for worker inside (8)
I believe the answer is:
begrudge
'resent' is the definition.
(synonyms)
'shift say ending for worker inside' is the wordplay.
I cannot really see how this works, but
'say' could be 'eg' (short for 'exempli gratia', 'for example' in Latin) and 'eg' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for begrudge that I've seen before include "Feel resentment and envy" , "Envy (someone) the possession of" , "Envy, be jealous of" , "Resent other's good fortune or possession" , "Reluctantly give up" .)