Bill for entrance bars (5)

I believe the answer is:

gates

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'bill' is the definition.
(Bill Gates)

'entrance bars' is the wordplay.
'entrance' becomes 'gate' (type of entrance).
'bars' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'gate'+'s'='GATES'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for gates that I've seen before include "Moveable barriers" , "Microsoft's Bill?" , "Confines (student) to college; entrances" , "Movable barriers in fence or wall" , "Billionaire Bill - openers" .)

I've seen this clue in the Sydney Morning Herald.

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