What does the cryptic crossword clue "Borderline character with impudence remains wild (12)" mean?

The wordplay uses an anagram. anagram of FRONT (synonym="impudence") + REMAINS (synonym="REMAINS") = FRONTIERSMAN The answer is FRONTIERSMAN.

Borderline character with impudence remains wild (12)

Guardian Cryptic #25714 | 22 Across | 2012-08-14 flower