Last thing fish will eat? (4)
I believe the answer is:
bait
'last' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'thing fish will eat?' is the wordplay.
I cannot really see how this works, but
'thing' could be 'it' and 'it' is present in the answer.
The remaining letters 'ba' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bait that I've seen before include "Food used as lure" , "N in radio comms" , "Boilie, for example" , "Angler's lure for fish" , "A lure to catch fish" .)