Cleans out bottle (4)
I believe the answer is:
guts
I believe this clue is a double definition.
'cleans out' is the first definition.
(as in gutting a building)
'bottle' is the second definition.
(I've seen this before)
(Other definitions for guts that I've seen before include "Pluck - viscera" , "Cleans - bottle" , "Daring" , "Fortitude and determination" , "Pluck -- intestines" .)