Sign of love from Henry the peacemaker (4)

I believe the answer is:

kiss

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'sign' is the definition.
(I have seen 'Sign of affection' mean 'kiss' so perhaps 'sign' could also mean 'kiss')

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for kiss that I've seen before include "Osculate" , "Amorous greeting" , "Expression of love" , "lightness of touch?" , "Embrace" .)

I've seen this clue in the Evening Standard.

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