Crossword Genius

Fish or hen sits on it (5)

Ross

I believe the answer is:

perch

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for perch that I've seen before include "[SOMETHING FISHY]" , "bird comes down on" , "Freshwater fish - roost" , "Bird's seat - fish" , "Bird's roost" .)

I've seen this clue in the Sydney Morning Herald.
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