At no time does doubling it provide extended payment terms (5)

I believe the answer is:

never

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'at no time' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for never that I've seen before include "Strong negative" , "'It's now or - - ' (14 song)" , "On no occasion" , "Surely not" , "Not in a month of Sundays" .)

I've seen this clue in The Guardian.

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