Back in Tehran, I’m escaping group meeting (7)
I believe the answer is:
seminar
'meeting' is the definition.
(seminar is a kind of meeting)
'back in tehran i'm escaping group' is the wordplay.
'back' is a reversal indicator.
'in' says the answer is hidden in the clue.
'ranimes' is hidden in the letters of 'tehran im escaping group'.
'ranimes' written backwards gives 'SEMINAR'.
(Other definitions for seminar that I've seen before include "Training meeting" , "University discussion" , "Teaching meeting, conference" , "Working meeting in College" , "Symposium" .)