Crossword Genius

Search for a swimmer (4)

Ross

I believe the answer is:

fish

I believe this is a double definition.

'search' is the first definition.
(I know that fish is a type of search)

'a swimmer' is the second definition.
(fish is a kind of aquatic vertebrate)

'for' acts as a link.

(Other definitions for fish that I've seen before include "occupant of tank" , "rock, perhaps" , "Aquarium" , "Weatherman" , "Search" .)

I've seen this clue in The Mirror.
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