Turn left regularly in this game? (4)
I believe the answer is:
golf
'this game?' is the definition.
(golf is a game)
'turn left regularly' is the wordplay.
'turn' becomes 'go' (a person's move in a board game).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternating letters of 'left' are 'lf'.
'go'+'lf'='GOLF'
'in' acts as a link.
(Other definitions for golf that I've seen before include "Open-air game" , "Game with tees" , "Game played on links" , "Leonhard -, Swiss mathematician/physicist" , "Game on course" .)