Two kisses signifying a betrayal? (6-5)

I believe the answer is:

double-cross

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'betrayal?' is the definition.
(double cross is a kind of betrayal)

I don't understand the remainder of the clue.

(Other definitions for double-cross that I've seen before include "Cheat - betray" , "Betray - XX?" , "Deceive supposed ally" , "Deceive, betray" , "Deceive (an ally, maybe)" .)

I've seen this clue in The Times.

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