Men guarding embattled sector (6)
I believe the answer is:
escort
'men guarding' is the definition.
'escort' can be an answer for 'guarding' (escort is a kind of guarding). I'm unsure of the 'men' bit.
'embattled sector' is the wordplay.
'sector' can be anagrammed to 'ESCORT'.
But, I'm unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for escort that I've seen before include "Armed guard" , "going in convoy" , "Protective accompaniment" , "Companion, perhaps for protection" , "Business providing companions for an evening out" .)