Air traffic control (8)

I believe the answer is:

elevator

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'air traffic control' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

This is all the clue.

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(Other definitions for elevator that I've seen before include "An American lift - going up?" , "Farm herd" , "Gentle caress" , "I go up" , "may give you a lift" .)

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

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