Time of year for demonstration? (5)
I believe the answer is:
march
I believe this is a double definition.
'time of year' is the first definition.
(the month)
'demonstration?' is the second definition.
(type of protest or demonstration)
'for' is the link.
(Other definitions for march that I've seen before include "Colonel Bogey, for example" , "Walk smartly" , "Parade" , "that happens fairly early each year" , "make progress" .)