Black spot for a street trader? (5)

I believe the answer is:

pitch

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'black' is the definition.
(pitch black is a kind of black)

I don't understand the remainder of the clue.

(Other definitions for pitch that I've seen before include "perfect for some players" , "Hurl" , "Residue of distillation" , "Erect (tent); steepness of roof" , "Throw - wicket - sports field" .)

I've seen this clue in the Evening Standard.

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