Play regularly after times in goal increase (6)
I believe the answer is:
expand
'increase' is the definition.
(expanding is a kind of increasing)
'play regularly after times in goal' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'after' is a charade indicator (letters next to each other).
'times' becomes 'x' (multiplication sign).
'in' means one lot of letters goes inside another.
'goal' becomes 'end' ('end' can be a synonym of 'goal'**).
The alternate letters of 'play' are 'pa'.
'pa' after 'x' is 'xpa'.
'xpa' going into 'end' is 'EXPAND'.
(Other definitions for expand that I've seen before include "Distend" , "Amplify" , "Fill out" , "Increase in bulk or importance" , "produce growth" .)