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Roe source (4)

Ross

I think it could be either:

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4

5*

shad

'roe source' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for shad that I've seen before include "fish that's been caught" , "Herring-like fish" , "Fish related to the herring" , "Fish; dash (anag.)" .)

I've seen this clue in the LA Times, the Penny Press and The New York Times.
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