Large Ford touring America's capital (6)
I believe the answer is:
lusaka
'capital' is the definition.
(Lusaka is an example)
'large ford touring america's' is the wordplay.
'large' becomes 'l'.
'ford' becomes 'ka' (the Ka is a type of Ford car).
'touring' indicates putting letters inside (touring can mean going round).
'america' becomes 'usa' ('U.S.A.' can be a synonym of 'america').
'l'+'ka'='lka'
'lka' enclosing 'usa' is 'LUSAKA'.
(Other definitions for lusaka that I've seen before include "African capital - UK alas (anag)" , "Capital of Zambia" , "Zambian capital" , "Central African capital" , "Zambian city" .)