What does the cryptic crossword clue "Arm broken — cast urgent (7-3)" mean?

The definition is "Arm". The wordplay uses an anagram. anagram of CAST + URGENT = SCATTER-GUN; definition: "Arm" The answer is SCATTER-GUN.

Arm broken — cast urgent (7-3)

Times Cryptic #29249 | 26 Across | 2025-06-06 flower