Spots going up and down (4)

I believe the answer is:

sees

This clue is a double definition.

'spots' is the first definition.
(I've seen this in another clue)

'going up and down' is the second definition.

(Other definitions for sees that I've seen before include "Observes the bishops' domains" , "Clocks" , "Spots" , "Understands" , "Observes or perceives" .)

I've seen this clue in the Sydney Morning Herald.

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