He introduces us to the girl (5)

I believe the answer is:

usher

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'he introduces' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'us to the girl' is the wordplay.
'to the girl' becomes 'her' ('her' refers to a girl or woman).
'us'+'her'='USHER'

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(Other definitions for usher that I've seen before include "Doorkeeper; one showing to place" , "One who should lead the way" , "Cinema or wedding official" , "Show in - escort" , "'The Fall of the House of -----', Edgar Allan Poe" .)

I've seen this clue in The Globe and Mail.

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