List of protagonists? (4)
I believe the answer is:
rota
'list' is the definition.
(I know that rota is a type of roll)
'of protagonists?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ROTA' is hidden within 'protagonists'.
(Other definitions for rota that I've seen before include "Cycle of duty" , "Task list, roster" , "List of duties taken in turn" , "List of people to do job in turns" , "Register of names for duties" .)