Latitude of unknown Scottish well towards the west (6)

I believe the answer is:

leeway

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

I don't understand how the rest of the clue works.

(Other definitions for leeway that I've seen before include "Space for free movement" , "Room to manoeuvre, as for a ship" , "Give" , "Margin of tolerance" , "Elbow room?" .)

I've seen this clue in The Independent.

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