Crossword Genius

Fancy £1000? (5)

Ross

I believe the answer is:

grand

'fancy' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for grand that I've seen before include "Magnificent, imposing" , "Comprehensive" , "Marvellous" , "principal" , "Fine" .)

I've seen this clue in The Times.
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