Crossword Genius

An operative who'll pass? (4)

Ross

I believe the answer is:

hand

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

This clue might be a double definition.

'an operative' is the first definition.
(I've seen this in other clues)

'who'll pass?' is the second definition.
'hand' can be an answer for 'pass?' (I've seen this before). I am not certain of the 'who'll' bit.

Can you help me to learn more?

(Other definitions for hand that I've seen before include "Limb extremity" , "Help < and applause" , "Index" , "Cards dealt to player" , "Manual worker" .)

I've seen this clue in the Evening Standard.
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