What does the cryptic crossword clue "Fail to understand where sidearm malfunctioning (7)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Fail to understand where sidearm malfunctioning (7)

Telegraph Prize Cryptic #3315 | 11 Across | 2025-05-04 flower

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