Slip out in time for show (7)
I believe the answer is:
display
'for show' is the definition.
(display can mean to show or expose)
'slip out in time' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'in' is an insertion indicator.
'time' becomes 'day' (day is a kind of time).
'slip' with letters rearranged gives 'ispl'.
'ispl' inserted within 'day' is 'DISPLAY'.
(Other definitions for display that I've seen before include "Demonstrate, show" , "Place on show" , "Exhibit, show" , "Put on show" , "Showcase" .)