Things such as drama roles encapsulating revolutionary from Niger (10,4)
I believe the answer is:
performing arts
'things such as drama' is the definition.
I can't judge whether this defines the answer.
'roles encapsulating revolutionary from niger' is the wordplay.
'roles' becomes 'parts' ('part' can be a synonym of 'role').
'encapsulating' indicates putting letters inside (inserted letters are absorbed or encapsulated).
'revolutionary' indicates anagramming the letters.
'from'+'niger'='fromniger'
'fromniger' anagrammed gives 'erforming'.
'parts' placed around 'erforming' is 'PERFORMING ARTS'.
Can you help me to learn more?
(Other definitions for performing arts that I've seen before include "field of activity?" , "Stage and screen" , "Music and drama" , "the field of dancers and musicians" , "stage shows, say" .)