Fish good with two fish (8)
I believe the answer is:
grayling
'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'
Can you help me to learn more?
(Other definitions for grayling that I've seen before include "Salmonoid fish" , "Catch" , "Fish - philosopher" , "Butterfly" , "Fish of the salmon family" .)