Faction invading ship are rogues (6)
I believe the answer is:
scamps
'are rogues' is the definition.
(I've seen this in another clue)
'faction invading ship' is the wordplay.
'faction' becomes 'camp' (both can mean a side in an argument).
'invading' is an insertion indicator.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'camp' inserted inside 'ss' is 'SCAMPS'.
(Other definitions for scamps that I've seen before include "Lively children" , "Mischevious young children" , "Little rascals, mischievous children" , "Naughty little rascals" , "'Rascals, imps (6)'" .)