Upland swallows (5)
I believe the answer is:
downs
I believe this clue is a double definition.
'upland' is the first definition.
(thesaurus)
'swallows' is the second definition.
(I've seen this in another clue)
(Other definitions for downs that I've seen before include "S. England chalk hills" , "Gently rolling hills" , "Knocks over; drinks" , "Naturally part of SE England" , "North or South, two features of chalk upland in England" .)