Hill in a pastoral area (3)
I believe the answer is:
tor
'hill' is the definition.
(I know that tor is a type of hill)
'in a pastoral area' is the wordplay.
'in' indicates a hidden word.
'TOR' is hidden in the letters of 'pastoral area'.
(Other definitions for tor that I've seen before include "feature of Glastonbury" , "Rocky prominence" , "Rot on a hill in Cornwall" , "Pillar of rock" , "Rot on a Cornish hill" .)