What does the cryptic crossword clue "Fell in action protecting what speeds up particles (5)" 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.

Fell in action protecting what speeds up particles (5)

Guardian Cryptic #29777 | 24 Down | 2025-08-19 flower

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