An Outsider, an Unexpectedly Successful Candidate

This page is the CodyCross answer for the clue below from Taking Care of Our Planet, Group 1577, Puzzle 4 (Car Emissions).

Question is: An Outsider, an Unexpectedly Successful Candidate

and the answer is: DARKHORSE

Word Meaning:

DARKHORSE — Having the character of a dark horse.

Definitions from Wiktionary.

An Outsider, An Unexpectedly Successful Candidate - Taking Care of Our Planet CodyCross Answers | CodyCross Solutions