Crossword Genius

The whole of the room, except Henry (3)

Ross

I believe the answer is:

all

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'the whole of' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for all that I've seen before include "nothing more" , "Passage in a formal garden" , "None excluded" , "Everybody; everything" , "Garden passage between trees or bushes" .)

I've seen this clue in The Times.
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