Way to secure permit for gambling game (8)
I believe the answer is:
roulette
'gambling game' is the definition.
(roulette is a kind of gambling game)
'way to secure permit' is the wordplay.
'way' becomes 'route' (route is a kind of way).
'to secure' means one lot of letters goes inside another.
'permit' becomes 'let' ('let' can be a synonym of 'permit').
'route' enclosing 'let' is 'ROULETTE'.
'for' acts as a link.
(Other definitions for roulette that I've seen before include "Gambling activity" , "Casino game" , "Gambling device" , "sort of gambling" , "Gambling game with small ball and revolving disc (8)" .)