Avian predator ignoring unusually large target (4)

I believe the answer is:

prey

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'target' is the definition.
(I know that target can be written as prey)

I can't explain the remainder of the clue.

(Other definitions for prey that I've seen before include "Hunter's quarry" , "Animal's victim" , "Hunted creature" , "Victim, quarry" , "Predator's victim" .)

I've seen this clue in The Independent.

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