Calm in areas yet (4)
I believe the answer is:
easy
'calm' is the definition.
(thesaurus)
'in areas yet' is the wordplay.
'in' indicates a hidden word.
'EASY' can be found hidden inside 'areas yet'.
(Other definitions for easy that I've seen before include "Facile" , "Relaxed" , "in plentiful supply" , "for a piece of cake" , "Convenient" .)