Many a TikTok user (4)

I believe the answer is:

teen

'many a tiktok user' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for teen that I've seen before include "Of 13 to 19 year olds" , "Juvenile" , "Youngster of a certain age" , "Adolescent (informal)" , "Youngster over twelve" .)

I've seen this clue in The Wall Street Journal and The New York Times.

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