Spots going up and down (4)

I believe the answer is:

sees

I believe this clue is a double definition.

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

'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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