Crossword Genius

Sit in the upper chamber (5)

Ross

I believe the answer is:

perch

'sit' is the definition.
(perching is a kind of sitting)

'in the upper chamber' is the wordplay.
'in' indicates a hidden word.
'PERCH' can be found hidden inside 'upper chamber'.

(Other definitions for perch that I've seen before include "A fish; alighting place" , "Bird's seat - fish" , "(Fishy) pole where bird sits" , "bird comes down on" , "Settle" .)

I've seen this clue in the Evening Standard.
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