Sort of river boatmen included in hired protesters (4-1-3)
I believe the answer is:
rent-a-mob
'included in hired protesters' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'sort of river boatmen' is the wordplay.
'sort of' is an anagram indicator.
'river' becomes 'r' (abbreviation for river).
'r'+'boatmen'='rboatmen'
'rboatmen' anagrammed gives 'RENT-A-MOB'.
Can you help me to learn more?
(Other definitions for rent-a-mob that I've seen before include "Crowd for hire" , "mass of people" , "Hired crowd (facet.)" .)