Seller that’s been exposed with fund (5)

I believe the answer is:

endow

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'fund' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for endow that I've seen before include "Enrich (with a facility or gift)" , "Enrich with a gift or faculty" , "Invest" , "Furnish, award" , "Attribute abilities to" .)

I've seen this clue in The Times.

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