Regions of the Far East (5)
I believe the answer is:
areas
'regions' is the definition.
(a region is an area or location)
'of the far east' is the wordplay.
'of' indicates a hidden word.
'AREAS' is hidden in the letters of 'far east'.
(Other definitions for areas that I've seen before include "Spaces covered by two-dimensional surfaces" , "Places" , "Localities" , "Zones" , "Geographical regions" .)