Calm monkey eating vegetables (7)
I believe the answer is:
appease
'calm' is the definition.
(appeasing is a kind of calming)
'monkey eating vegetables' is the wordplay.
'monkey' becomes 'ape' (I've seen this before).
'eating' indicates putting letters inside.
'vegetables' becomes 'peas' (I've seen this before).
'ape' enclosing 'peas' is 'APPEASE'.
(Other definitions for appease that I've seen before include "Quiet" , "be satisfying" , "Placate (someone) with concessions" , "Conciliate" , "Propitiate by concessions" .)