A lot of money for a bun (3)

I believe the answer is:

wad

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'a lot of money' is the definition.
(wad of cash)

I don't understand the rest of the clue.

(Other definitions for wad that I've seen before include "A thick bundle, maybe of money" , "Bundle of soft material or of banknotes" , "Compact mass" , "Small bundle" , "Bankroll; sandwich (slang)" .)

I've seen this clue in the Evening Standard.

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