Boundary, demarcation line (5)

I believe the answer is:

limit

I believe this clue is a double definition.

'boundary' is the first definition.
(synonyms)

'demarcation line' is the second definition.
(synonyms)

(Other definitions for limit that I've seen before include "verge" , "qualify?" , "Place bound on" , "Restrict to specified range" , "end" .)

I've seen this clue in The Irish Times.

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