Everybody in the gallery (3)

I believe the answer is:

all

'everybody' is the definition.
(all people)

'in the gallery' is the wordplay.
'in' says the answer is hidden in the clue.
'ALL' is hidden within 'gallery'.

(Other definitions for all that I've seen before include "Comprising every individual one" , "and 16 Across and 23 Across: Even so" , "without exception" , "nothing more" , "Avenue, walk or garden path" .)

I've seen this clue in the Evening Standard.

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