Fed's letter intercepted by another (5)
I believe the answer is:
eaten
'fed's' is the definition.
(I've seen this before)
'letter intercepted by another' is the wordplay.
I cannot really see how this works, but
'letter' could be 'en' (I've seen this in other clues) and 'en' is found within the answer.
'by' could be 'at' and 'at' is found in the answer.
'another' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for eaten that I've seen before include "corroded" , "Devoured" , "courses enjoyed?" , "Taken into the body as food" , "having enjoyed dinner?" .)