Crossword Genius

Natural food of the osprey (4)

Ross

I believe the answer is:

prey

I'm a little stuck... Click here to teach me more about this clue!

'natural' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'food of the osprey' is the wordplay.
'PREY' is hidden within the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for prey that I've seen before include "Animal hunted or caught for food" , "Animal hunted and killed for food" , "Quarry, target" , "Animal's victim" , "Animal's quarry" .)

I've seen this clue in the Evening Standard.
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