Spiny-finned freshwater fish (5)

I believe the answer is:

perch

(Other definitions for perch that I've seen before include "Resting place for a bird and old measure" , "Roost; old measure" , "Rest (as a bird)" , "Freshwater fish - roost" , "Roosting place" .)

I've seen this clue in The Guardian and The Telegraph.

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