Young woman touring Vienna heading off (5)
I believe the answer is:
annie
'young woman' is the definition.
'touring vienna heading off' is the wordplay.
'touring' is an anagram indicator (touring can mean moving around).
'heading off' means to remove the first letter.
'vienna' with its initial letter removed is 'ienna'.
'ienna' anagrammed gives 'ANNIE'.
(Other definitions for annie that I've seen before include "Musical based on cartoon strip" , "-- Laurie, Scots song" , "Sharpshooter Oakley or musical orphan" , "Popular musical about girl orphan" , "Miss Laurie" .)