£1000? Fantastic! (5)

I believe the answer is:

grand

I'm a little stuck... Click here to teach me more about this clue!

'fantastic' is the definition.
(I know that fantastic can be written as grand)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for grand that I've seen before include "Impressive, large" , "Magnificent, imposing" , "great distinction" , "Splendid - piano" , "Stately - splendid" .)

I've seen this clue in The Sun.

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