Catch sight of Mark (4)

I believe the answer is:

spot

This clue is a double definition.

'catch sight of' is the first definition.
(to spot is to notice or catch sight of)

'mark' is the second definition.
(I know that spot is a type of mark)

(Other definitions for spot that I've seen before include "Small mark; see" , "Observe - place" , "Dirty blemish" , "See; pimple" , "point on snooker table" .)

I've seen this clue in The Times and The Guardian.

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