Crossword Genius

Fish that hurt dog (6)

Ross

I believe the answer is:

shadow

'dog' is the definition.
(thesaurus)

'fish that hurt' is the wordplay.
'fish' becomes 'shad' (shad is a kind of fish**).
'that hurt' becomes 'ow' (I've seen this in other clues).
'shad'+'ow'='SHADOW'

(Other definitions for shadow that I've seen before include "opposing counterpart" , "Dark area from which light is blocked" , "Dark area - referring to parliamentary opposition" , "Darker part" , "Trail" .)

I've seen this clue in The Independent and The Times.
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