Bill from Microsoft — for supplying Access? (5)

I believe the answer is:

gates

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'bill' is the definition.
(Bill Gates)

I cannot understand how the remainder of the clue works.

(Other definitions for gates that I've seen before include "Openings" , "Stage is set for them to open and close" , "Hinged barriers serving as entrances" , "philanthropist" , "Moveable barriers" .)

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