Workers’ leaders about to go — time to agitate (6)
I believe the answer is:
foment
'agitate' is the definition.
(synonyms)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for foment that I've seen before include "Arouse or stimulate, maybe trouble" , "Instigate, stir up" , "Arouse or stimulate, perhaps trouble" , "Arouse or stimulate, say trouble" , "Stir up or stimulate, say trouble" .)