A score producing kisses? (6)
I believe the answer is:
twenty
'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" .)