Better game allowed to get in the way (8)
I believe the answer is:
roulette
'better game' is the definition.
(game which people bet on)
'allowed to get in the way' is the wordplay.
'allowed to' becomes 'let' (to let something happen is to allow it).
'get in' is an insertion indicator.
'the way' becomes 'route' (route is a kind of way).
'let' going within 'route' is 'ROULETTE'.
(Other definitions for roulette that I've seen before include "If Russian, it's a very dangerous game" , "Spinning-wheel game" , "risky venture" , "Wheel for the gambler" , "Form of gambling" .)