Face irate members assembled in restaurant (9)
I believe the answer is:
cafeteria
'assembled in restaurant' is the definition.
'cafeteria' can be an answer for 'restaurant' (cafeteria is a kind of restaurant). I am not certain of the 'assembled in' bit.
'face irate members' is the wordplay.
'members' is an anagram indicator (members or parts of the anagram in a different way).
'face'+'irate'='faceirate'
'faceirate' with letters rearranged gives 'CAFETERIA'.
Can you help me to learn more?
(Other definitions for cafeteria that I've seen before include "cheap restaurant" , "where food is served" , "place of refreshment" , "Where one scoffs" , "eating-place" .)