What does the cryptic crossword clue "Such a persuasive speaker's mouth doesn't go askew (6,7)" mean?

The wordplay uses an anagram. anagram of MOUTH + DOESN'T + GO = SMOOTHTONGUED The answer is SMOOTHTONGUED.

Such a persuasive speaker's mouth doesn't go askew (6,7)

Daily Mail Cryptic #16779 | 15 Across | 2022-02-23 flower