Warriors mostly told to surround an odd revolutionary (7)
I believe the answer is:
samurai
'warriors' is the definition.
(I've seen this before)
'told to surround an odd revolutionary' is the wordplay.
'told' becomes 'sai' (I can't justify this - if you can you should give a lot more credence to this answer).
'to surround' is an insertion indicator.
'an' becomes 'a'.
'odd' becomes 'rum' (rum can mean strange or dubious).
'revolutionary' says the letters should be written in reverse.
'a'+'rum'='arum'
'arum' reversed gives 'mura'.
'sai' enclosing 'mura' is 'SAMURAI'.
'mostly' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for samurai that I've seen before include "Japanese military retainer" , "Member of Japanese warrior caste" , "Traditional Japanese warrior" , "Trad. Japanese warrior caste" , "Japanese fighter" .)