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Being fishy, possibly hard to eat (3)

Ross

I believe the answer is:

roe

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'being' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

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(Other definitions for roe that I've seen before include "Fish eggs; small deer" , "A mass of fish-eggs" , "Swift runner" , "Part of fish, sounds like go through water" , "Caviar" .)

I've seen this clue in the Evening Standard.
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