Fish good with two fish (8)

I believe the answer is:

grayling

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'fish' is the definition.
(I've seen this before)

'good with two fish' is the wordplay.
'good' becomes 'g' (abbreviation).
'with two' becomes 'ray' (I can't explain this - if you can you should believe this answer much more).
'fish' becomes 'ling' (ling is a kind of fish).
'g'+'ray'+'ling'='GRAYLING'

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(Other definitions for grayling that I've seen before include "Salmonoid fish" , "Catch" , "Fish - philosopher" , "Butterfly" , "Fish of the salmon family" .)

I've seen this clue in The Guardian.

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