A well-supplied business organisation (3,7)

I believe the answer is:

oil company

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'organisation' is the definition.
(oil company is a kind of organization)

'a well-supplied business' is the wordplay.
'a well' becomes 'oil' (oil well is a kind of well).
'supplied business' becomes 'company' (I am not sure about this - if you are sure you should believe this answer much more).
'oil'+'company'='OIL COMPANY'

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I've seen this clue in The Globe and Mail.

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