Where to take off kit after show (8)
I believe the answer is:
airstrip
'where to take off' is the definition.
(where an aircraft takes off)
'kit after show' is the wordplay.
'kit' becomes 'strip' (I've seen this in other clues).
'after' says to put letters next to each other.
'show' becomes 'air' (both can mean broadcast).
'strip' after 'air' is 'AIRSTRIP'.
(Other definitions for airstrip that I've seen before include "Place for taking off" , "possible starting place" , "Temporary runway" , "Small flying field" , "Small runway" .)