A youth of modish dress-consciousness? (3)

I believe the answer is:

mod

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'a youth' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for mod that I've seen before include "1960s teenager" , "Gaelic literary festival" , "Meeting of the Scottish" , "Rocker's rival?" , "ministry" .)

I've seen this clue in the Evening Standard.

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