Unspecified large number (7)

I believe the answer is:

umpteen

'unspecified large number' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for umpteen that I've seen before include "Plentiful" , "Informally, very many" , "Lots of things on pet menu" , "Unspecified large number" , "Great in number but unspecified" .)

I've seen this clue in The Times.

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