Crossword Genius

Standard river fish (4)

Ross

I believe the answer is:

parr

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

'standard river' is the wordplay.
'standard' becomes 'par' (I've seen this before).
'river' becomes 'r'.
'par'+'r'='PARR'

(Other definitions for parr that I've seen before include "Catherine ---, Henry VIII's widow" , "survivor of the decapitator?" , "Young salmon; Queen Catherine ---" , "Katherine --, last wife of Henry VIII" , "Young salmon with spots" .)

I've seen this clue in The Independent.
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