Found above ground in a hilly area (6)
I believe the answer is:
upland
'a hilly area' is the definition.
(I've seen this before)
'found above ground' is the wordplay.
'found above' becomes 'up' (I can't explain this - if you can you should give a lot more credence to this answer).
'ground' becomes 'land' (synonyms).
'up'+'land'='UPLAND'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for upland that I've seen before include "Hilly area" , "Area of hills" , "Elevated area" , "High or hilly terrain" , "moors?" .)