Cabaret puzzles completely: in what way? (5,4)
I believe the answer is:
floor show
'cabaret' is the definition.
(I know that cabaret can be written as floor show)
'puzzles completely in what way?' is the wordplay.
'puzzles completely' becomes 'floors' (floor can mean to puzzle or shock).
'in what way?' becomes 'how' ('how' can be a synonym of 'in what way').
'floors'+'how'='FLOOR SHOW'
(Other definitions for floor show that I've seen before include "Cabaret" , "Nightclub entertainment" , "Night club performance" , "Performance not staged" , "not raised performance?" .)