Crossword Genius

A touching sign of affection (6)

Ross

I believe the answer is:

caress

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'a touching' is the definition.
(caress is a kind of touching)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for caress that I've seen before include "Stroke lightly in a loving manner" , "Gentle loving touch" , "show of affection" , "Stroke fondly" , "Tenderly stroke" .)

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