Left about to get into capital (6)
I believe the answer is:
london
'capital' is the definition.
(London is an example)
'left about to get into' is the wordplay.
'left' becomes 'l' (common abbreviation).
'about' becomes 'on' (**).
'to get into' becomes 'don' ('don' can be a synonym of 'get into').
'l'+'on'+'don'='LONDON'
(Other definitions for london that I've seen before include "City for the non-old, oddly" , "source of this paper" , "Jack - , US author (White Fang); city" , "- Clay; - pride; - plane" , "English capital" .)