What does the cryptic crossword clue "Dissident group ousting leader in fratricidal gesture (6)" mean?

The definition is "gesture". The wordplay uses a deletion. ACTION (deletion) = ACTION; definition: "gesture" The answer is ACTION.

Dissident group ousting leader in fratricidal gesture (6)

Guardian Cryptic #29281 | 12 Across | 2024-01-17 flower