Good! Fish, fish and fish (8)
I believe the answer is:
grayling
'fish' is the definition.
(I've seen this before)
'good fish fish' is the wordplay.
'good' becomes 'g' (abbreviation).
'fish' becomes 'ray' (ray is a kind of fish).
'fish' becomes 'ling' (ling is a kind of fish).
'g'+'ray'+'ling'='GRAYLING'
'and' is the link.
(Other definitions for grayling that I've seen before include "Catch" , "Fish - philosopher" , "Butterfly" , "Fish of the salmon family" , "Salmonoid fish" .)