Blair is touring a city (8)
I believe the answer is:
brasilia
'city' is the definition.
(capital of Brazil)
'blair is touring a' is the wordplay.
'touring' is an anagram indicator (touring can mean moving around).
'blair'+'is'='blairis'
'blairis' is an anagram of 'brasili'.
'brasili'+'a'='BRASILIA'
(Other definitions for brasilia that I've seen before include "Capital city of Brazil" , "SA capital" , "11 [CAPITAL]" , "South American capital" .)