Periodic payment; salary (7)
I believe the answer is:
stipend
This clue is a double definition.
'periodic payment' is the first definition.
(I've seen this in another clue)
'salary' is the second definition.
(I've seen this before)
(Other definitions for stipend that I've seen before include "Official income of Protestant clergyman" , "Minister's salary" , "Soldier's pay" , "Clergyman's salary" , "minister's wages" .)