Crossword Genius

Fin on a fish's back (6)

Ross

I believe the answer is:

dorsal

(Other definitions for dorsal that I've seen before include "On the upper back" , "Fin on the back of marine vertebrates" , "Kind of fin" , "On the back, fin on a fish say" , "(Of fin) on upper side" .)

I've seen this clue in The Sun.
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