Escort rebellious mutineer, abandoning leader (7)
I believe the answer is:
retinue
'escort' is the definition.
(thesaurus)
'rebellious mutineer abandoning leader' is the wordplay.
'rebellious' indicates an anagram.
'abandoning leader' means to remove the first letter.
'mutineer' with its initial letter taken away is 'utineer'.
'utineer' is an anagram of 'RETINUE'.
(Other definitions for retinue that I've seen before include "Group following an important person" , "Group of servants with important person" , "VIP's attendants" , "Train; attendants" , "Cortege" .)