Character smartly going out of turn (5)
I believe the answer is:
faust
'character' is the definition.
(Faust is an example)
'smartly going out of turn' is the wordplay.
'smartly going' becomes 'fast' (I can't explain this - if you can you should believe this answer much more).
'out of' means one lot of letters goes inside another (some letters on the outside of others).
'turn' becomes 'U' (a 'U-turn' is a kind of turn).
'fast' placed around 'u' is 'FAUST'.
Can you help me to learn more?
(Other definitions for faust that I've seen before include "Cautionary tale" , "Alchemist" , "1 28 [EPIC POEM]" , "Goethe play" , "Opera" .)