Angry boss must accept vacant type (6)
I believe the answer is:
heated
'angry' is the definition.
(thesaurus)
'boss must accept vacant type' is the wordplay.
'boss' becomes 'head' ('head' can be a synonym of 'boss').
'must accept' means one lot of letters goes inside another.
'vacant' suggests removing the centre.
'type' with its centre removed is 'te'.
'head' going around 'te' is 'HEATED'.
(Other definitions for heated that I've seen before include "Angry - passionate" , "Baked; angry" , "fired" , "Raised the temperature" , "Fired-up" .)