Crossword Genius

Fishy source of venison? (3)

Ross

I believe the answer is:

roe

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

'venison?' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'fishy source of' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 're' 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 roe that I've seen before include "Fish eggs; small deer" , "Part of fish, sounds like go through water" , "If hard, eggs" , "eg Caviare" , "Swift runner" .)

I've seen this clue in the Evening Standard.
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