Overwrought porter has called (6,3)
I believe the answer is:
strung out
'overwrought' is the definition.
(thesaurus)
'porter has called' is the wordplay.
'porter' becomes 'stout' (porter can mean stout).
'has' indicates putting letters inside.
'called' becomes 'rung' (ring can mean to call on the phone).
'stout' enclosing 'rung' is 'STRUNG-OUT'.
(Other definitions for strung out that I've seen before include "on drugs" , "weak as a result of drug addiction" , "Keep well apart" , "Nervous" , "Exhausted" .)