Play Devil's __; Use the Contentious Argument

This page is the CodyCross answer for the clue below from Train Travel, Group 718, Puzzle 1 (Boarding Time).

Question is: Play Devil's __; Use the Contentious Argument

and the answer is: ADVOCATE

Word Meaning:

ADVOCATE — Someone whose job is to speak for someone's case in a court of law; a counsel.

Definitions from Wiktionary.

Play devil's __; use the contentious argument — CodyCross Answer | CodyCross Solutions