Crossword Genius

Exactly zero t-shirts etc. returned (4-2)

Ross

I believe the answer is:

spot-on

'exactly' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for spot-on that I've seen before include "Informally precise, receiving no post" , "Perfect" , "Precisely, in informal manner" , "Precisely what's required" , "Informally - exactly so, precisely" .)

I've seen this clue in The Everyman puzzle in The Observer.
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