Grants one is permissive (6)

I believe the answer is:

allows

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'grants' is the definition.
(I know this)

I don't understand the rest of the clue.

(Other definitions for allows that I've seen before include "Permits, lets" , "Gives permission" , "Permits or agrees" , "Permits to do something" , "Grants leave" .)

I've seen this clue in the Evening Standard.

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