Long narrow mark (4)

I believe the answer is:

line

'long narrow mark' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for line that I've seen before include "Railway track; wrinkle" , "column" , "Ancestry" , "job" , "Winter sports slope" .)

I've seen this clue in The Times, the Irish Times (Simplex), the Evening Standard and The Mirror.

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