Roe source

I think it could be either:

Which length description are you looking for?:

4 5*

'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 New York Times, the Penny Press and the LA Times.

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