Very large area of fair dismantled by state (6)
I believe the answer is:
africa
'very large area' is the definition.
'fair dismantled by state' is the wordplay.
'dismantled' is an anagram indicator.
'by' means one lot of letters go next to another.
'state' becomes 'ca'.
'fair' anagrammed gives 'afri'.
'afri'+'ca'='AFRICA'
'of' acts as a link.
(Other definitions for africa that I've seen before include "Location of 14 downb" , "RAF and CIA strangely together on the continent" , "Continent (6)" , "If a car could go to this continent" , "Out of -, novel by Karen Blixen (filmed)" .)