Male, upper-class, leading very small uprising (6)
I believe the answer is:
mutiny
'uprising' is the definition.
(I know that mutiny is a type of uprising)
'male upper-class leading very small' is the wordplay.
'male' becomes 'm' (common abbreviation).
'upper-class' becomes 'u' (similar in meaning).
'leading' says to put letters next to each other.
'very small' becomes 'tiny' (I've seen this in another clue).
'm'+'u'+'tiny'='MUTINY'
(Other definitions for mutiny that I've seen before include "Rising, rebellion" , "Military rebellion" , "Open rebellion by sailors or soldiers" , "Rebellion as on Bligh's Bounty" , "Open rebellion against constituted authority" .)