Foreign banker tests businesses (10)

I believe the answer is:

industries

'businesses' is the definition.
(industry is a kind of business)

'foreign banker tests' is the wordplay.
'foreign banker' becomes 'indus' (River Indus, a foreign river or 'bank-er').
'tests' becomes 'tries' ('try' can be a synonym of 'test').
'indus'+'tries'='INDUSTRIES'

(Another definition for industries that I've seen is " commercial enterprises".)

I've seen this clue in The Telegraph.

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