Standard recipe for salmon (4)
I believe the answer is:
parr
'salmon' is the definition.
(I've seen this before)
'standard recipe' is the wordplay.
'standard' becomes 'par' (I've seen this before).
'recipe' becomes 'r' (abbreviation).
'par'+'r'='PARR'
'for' acts as a link.
(Other definitions for parr that I've seen before include "survivor of the decapitator?" , "Fish" , "Henry's sixth (his third 7!)" , "Wife surviving" , "Catherine --, Henry VIII's sixth wife" .)