Crossword Genius

Piano for the finale? (5)

Ross

I believe the answer is:

grand

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'piano' is the definition.
(grand piano is a kind of piano)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for grand that I've seen before include "GBP1,000" , "A slangy PS1,000" , "1,000 GBP" , "principal" , "Impressive, large" .)

I've seen this clue in the Evening Standard.
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