Self-contradictory sort of band! (3,3)

I believe the answer is:

one man

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'sort of band' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for one man that I've seen before include "Having individual person" , "such a small band" , "Type of band" .)

I've seen this clue in the Evening Standard.

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