rent-a-rent-a- /ˈrent ə/ prefix informal 
used to describe or refer to someone who is always willing to do something – used to show disapproval: 
a rent-a-mob (=people who are always willing to go and protest somewhere) a rent-a-quote politician (=one who is always willing to make a statement about a subject)
used to describe or refer to someone who is always willing to do something – used to show disapproval: a rent-a-mob (=people who are always willing to go and protest somewhere) a rent-a-quote politician (=one who is always willing to make a statement about a subject)