Crossword Genius

Second movement (6,3)

Ross

I believe the answer is:

number two

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

This clue could be a double definition.

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

'movement' is the second definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for number two that I've seen before include "Second-in-command" , "Assistant" , "Second in command" , "vice" , "deputy" .)

I've seen this clue in The Guardian.
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