What does the cryptic crossword clue "Prone to be standing up to with determination (6,4)" mean?

The definition is "Prone to be standing up to with determination". The wordplay uses a double definition. Double definition The answer is FACINGDOWN.

Prone to be standing up to with determination (6,4)

Guardian Cryptic #29032 | 23 Across | 2023-03-31 flower