Journey around grand upland area (5)
I believe the answer is:
ridge
'upland area' is the definition.
(eg a mountain ridge)
'journey around grand' is the wordplay.
'journey' becomes 'ride' (riding is a kind of journeying).
'around' indicates putting letters inside.
'grand' becomes 'g' (G is short for grand as in a thousand).
'ride' enclosing 'g' is 'RIDGE'.
(Other definitions for ridge that I've seen before include "Crest - spine" , "Rooftop" , "Line of higher ground" , "Hog's back" , "Long raised band" .)