Among those characters in speed dating falling head over heels with Count (3)

I believe the answer is:

add

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'count' is the definition.
(adding is a kind of counting)

I can't explain the rest of the clue.

(Other definitions for add that I've seen before include "do some mathematics" , "put two and two together" , "Increase" , "Go further" , "Include" .)

I've seen this clue in The Irish Times.

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