A sign with which to greet us? (7)

I believe the answer is:

gesture

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

'a sign' is the definition.
(gesture is a kind of sign)

'which to greet us?' is the wordplay.
'greet us' can be anagrammed to 'GESTURE'.
But, I am not sure how this is indicated.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for gesture that I've seen before include "Movement to express something" , "Significant movement" , "Hand signal" , "Expressive arm movement" , "Sign with the hand" .)

I've seen this clue in the Evening Standard.

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