Rig one area (6)
I believe the answer is:
region
'area' is the definition.
(I know that area can be written as region)
'rig one' is the wordplay.
'rig one' anagrams to 'REGION'.
But, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for region that I've seen before include "Area of country" , "Area - district" , "Tract or area" , "Kind of territory to ignore" , "Area, domain" .)