What does the cryptic crossword clue "Arm better, if leg's bandaged (5)" mean?

The definition is "Arm". The wordplay uses a hidden word. Hidden in "arm betteR, IF LEg's bandaged" The answer is RIFLE.

Arm better, if leg's bandaged (5)

Guardian Cryptic #29163 | 13 Across | 2023-08-31 flower