Nothing but a clean sheet, possibly (3)

I believe the answer is:

nil

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'nothing' is the definition.
(eg nil is zero in football)

I don't understand the rest of the clue.

(Other definitions for nil that I've seen before include "duck" , "Latin zero" , "Nothing, zero" , "Nothing, no score" , "Love" .)

I've seen this clue in the Evening Standard.

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