The most common and most likely answer to this crossword clue is the 6 letter word EXMOOR
E
X
M
O
O
R
More clues leading to the result EXMOOR
- Area of Somerset no longer low, with river?
- Partner no longer to make fast ground in SW England
- Old doctor regaled at first with a load of old pony!
- Partner once finding somewhere to sleep over in part of the West Country
- Pony ride finishing times with scope to be put back
- Old North African upland area
- Park to the west of Middlesex with deer around
- Area on Britain’s bottom left, formerly on the lower right
- Test going without a jumper over hilly area of Britain
- Wild scene in Othello with former lover at forefront
Buddy explains!

The straight part
We know that "upland area" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case upland area = exmoor.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.