That place cast regularly enters? (7)
I believe the answer is:
theatre
'that place cast regularly enters?' is the definition.
I can't judge whether this defines the answer.
'that place cast regularly enters?' is the wordplay.
'that place' becomes 'there' (as opposed to 'here' meaning this place).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'enters?' indicates putting letters inside.
The alternate letters of 'cast' are 'at'.
'there' placed around 'at' is 'THEATRE'.
Can you help me to learn more?
(Other definitions for theatre that I've seen before include "Play scene" , "Surgeon can be seen here" , "Art of writing and producing plays" , "Space for 11 across art" , "(Military) field of action" .)