Crossword Genius

Spooner's worked out setter is unmissable (4-3)

Ross

I believe the answer is:

must-see

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'unmissable' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for must-see that I've seen before include "Unmissable" , "Remarkable sight" .)

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