Largely quiet, very little rebellion (6)
I believe the answer is:
mutiny
'rebellion' is the definition.
(mutiny is a kind of rebellion)
'largely quiet very little' is the wordplay.
'largely' means to remove the last letter.
'quiet' becomes 'mum' (I've seen this before).
'very little' becomes 'tiny'.
'mum' with its final letter taken away is 'mu'.
'mu'+'tiny'='MUTINY'
(Other definitions for mutiny that I've seen before include "Open rebellion by sailors or soldiers" , "Rising, rebellion" , "Military rebellion" , "Rebellion in the armed forces" , "Revolt against authority" .)