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Token of sincerity - and nervousness (9)

Ross

I believe the answer is:

handshake

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

This clue could be a double definition.

'token of sincerity' is the first definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'nervousness' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'and' is the link.

Can you help me to learn more?

(Other definitions for handshake that I've seen before include "A link" , "Physical greeting" , "Gesture of greeting or of agreeing a deal" , "Conventional greeting of manual kind" , "acknowledgment" .)

I've seen this clue in The Globe and Mail.
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