She repeatedly left a six-footer outside! (5)
I believe the answer is:
belle
'she' is the definition.
'repeatedly left a six-footer outside' is the wordplay.
'repeatedly left' becomes 'bel' (I can't justify this - if you can you should give a lot more credence to this answer).
'a six-footer' becomes 'louse' (a louse has six feet).
'outside' means to remove the middle letters.
'louse' with its middle taken out is 'le'.
'bel'+'le'='BELLE'
Can you help me to learn more?
(Other definitions for belle that I've seen before include "Most attractive girl" , "Reigning beauty" , "dish" , "Handsome lady of the Ball?" , "Beautiful woman - of the ball?" .)