Map of the southern uplands (4)

I believe the answer is:

plan

'map' is the definition.
(thesaurus)

'of the southern uplands' is the wordplay.
'of' says the answer is hidden in the clue.
'PLAN' can be found hidden inside 'southern uplands'.

(Other definitions for plan that I've seen before include "Scale drawing; scheme" , "Devise a strategy" , "Stratagem" , "Agenda" , "Diagram; design" .)

I've seen this clue in the Evening Standard.

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