Regularly action team attached to a leisure venue (6)
I believe the answer is:
cinema
'leisure venue' is the definition.
'regularly action team attached to a' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'attached to' is a charade indicator (letters next to each other).
'action'+'team'='actionteam'
The alternating letters of 'actionteam' are 'cinem'.
'cinem'+'a'='CINEMA'
(Other definitions for cinema that I've seen before include "Movies, pictures" , "The big screen" , "The flicks" , "place for pictures" , "Film theatre" .)