Committed sort of chef holds anger back (7)
I believe the answer is:
serious
'committed' is the definition.
(thesaurus)
'sort of chef holds anger back' is the wordplay.
'sort of chef' becomes 'sous' (I can't explain this - if you can you should believe this answer much more).
'holds' is an insertion indicator.
'anger' becomes 'ire' (ire is intense rage).
'back' says the letters should be written in reverse.
'ire' back-to-front is 'eri'.
'sous' placed around 'eri' is 'SERIOUS'.
Can you help me to learn more?
(Other definitions for serious that I've seen before include "Important - solemn" , "Earnest - important" , "Stern" , "Important -- grave" , "Earnest; vital" .)