Both Uses

advocate
in
The Hate U Give
(Edited)

We are a small organization here in Garden Heights that advocates for police accountability.
p. 129.4 *

advocates = publicly supports
Besides being an advocate, I'm also an attorney.
p. 135.7 *

advocate = a person who publicly supports and works to advance a cause

Definitions:

(1) (advocate as in: to advocate)
to recommend or publicly support (someone or something)
(2) (advocate as in: an advocate supporting)
a person who publicly supports and works to advance a cause

or more rarely:

someone acting in the role of a defense lawyer in England's past and in some jurisdictions today
(3) (advocate as in: an advocate in court)
a lawyer or officer of the court in some jurisdictions in Europe, colonial America, and the military
(4) (devil's advocate as in: I'll play the devil's advocate)
a person who takes an unpopular position to encourage debate or test ideas
(5) (meaning too rare to warrant focus)