Male in RADA cast in theatre (5)
I believe the answer is:
drama
'theatre' is the definition.
(thesaurus)
'male in rada cast' is the wordplay.
'male' becomes 'm' (common abbreviation).
'in' indicates putting letters inside.
'cast' indicates anagramming the letters.
'rada' is an anagram of 'draa'.
'm' going within 'draa' is 'DRAMA'.
'in' is the link.
(Other definitions for drama that I've seen before include "Literary genre for the stage" , "Theatrical production" , "Play - crisis" , "Literary genre for the theatre" , "Play; emotional event" .)