A "passionate advocate" is someone who strongly supports and fights for a particular cause or belief with great enthusiasm and dedication. Full definition
What I suggest is in no way a criticism of the judges or shortlisted books: few awards have such a rigorous judging process involving such passionate advocates of children's literacy. (thebookseller.com)
A spokesperson for the firm said they have «become passionate advocates of this collaborative way of working». (totumpartners.com)
As personal injury lawyers, they take pride in providing this kind of care and they are passionate advocates on behalf of their clients. (sasserlawoffice.com)