Guardian concocted non-U type of dressing (2,4)

I believe the answer is:

in drag

'type of dressing' is the definition.

I cannot understand how the rest of the clue works.

(Other definitions for in drag that I've seen before include "Man wearing female dress" , "dressed like a queen" , "Daring (anag)" .)

I've seen this clue in The Guardian.

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