Crossword Genius

A score producing kisses? (6)

Ross

I believe the answer is:

twenty

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'a score' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for twenty that I've seen before include "Dozen plus eight" , "Number" , "made by Q on a light blue square" , "Hundredweights to a ton" , "No longer a teenager" .)

I've seen this clue in The Telegraph.
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