Crossword Genius

Everyone is on board to make major bet (3,2)

Ross

I believe the answer is:

all in

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

'on board to make major bet' is the definition.
I can't tell whether this defines the answer.

'everyone' is the wordplay.
I cannot really understand how this works, but
'everyone' could be 'all' (all people) and 'all' is found in the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'is' acts as a link.

Can you help me to learn more?

(Other definitions for all in that I've seen before include "With everything included" , "What's spent" , "At an inclusive price; exhausted" , "Utterly exhausted - everyone home" , "Everyone's home - exhausted" .)

I've seen this clue in The Guardian.
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