Crossword Genius

Found a ring was missing from the collection (4)

Ross

I believe the answer is:

fund

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'collection' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for fund that I've seen before include "Pool of money" , "Provide with money, say project" , "Pool - float" , "Monetary resources" , "Finance" .)

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