Replace budgie food picked up after half-hearted late feed (9)
I believe the answer is:
supersede
'replace' is the definition.
(synonyms)
'budgie food picked up after half-hearted late feed' is the wordplay.
I cannot quite understand how this works, but
'food' could be 'e' (E is an example) and 'e' is found within the answer.
'up' is found in the answer.
'late' could be 'd' and 'd' is found in the answer.
This explanation may well be incorrect...
(Other definitions for supersede that I've seen before include "Take the place of, override" , "set aside" , "Take the place of, supplant" , "Stop using" , "Supplant, replace" .)