When it's finished, locals say American agent will be stuffed (7)
I believe the answer is:
overfed
'be stuffed' is the definition.
(I've seen this before)
'when it's finished locals say american agent' is the wordplay.
I cannot quite see how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
'agent' could be 'fed' (fed is a kind of agent) and 'fed' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'will' is the link.
Can you help me to learn more?
(Other definitions for overfed that I've seen before include "having had too much on one's plate?" , "stuffed" .)