A touch of life, perhaps? (4)

I believe the answer is:

kiss

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'a touch' is the definition.
(I know that kiss is a type of touch)

I don't understand the remainder of the clue.

(Other definitions for kiss that I've seen before include "x (that may be French)" , "Smooch" , "Salute" , "Act of osculation" , "Touching of lips" .)

I've seen this clue in the Evening Standard.

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