Sit in a proper chair (5)

I believe the answer is:

perch

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

'in a proper chair' is the wordplay.
'in' says the answer is hidden in the clue.
'PERCH' is hidden within 'proper chair'.

(Other definitions for perch that I've seen before include "Roosting place" , "[SOMETHING FISHY]" , "(Fishy) pole where bird sits" , "What angler may catch" , "Fish; pole" .)

I've seen this clue in the Evening Standard.

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