Queen with extremely awful temper (6)
I believe the answer is:
anneal
'temper' is the definition.
('anneal' can be a synonym of 'temper')
'queen with extremely awful' is the wordplay.
'queen' becomes 'anne' (I've seen this before**).
'with' means one lot of letters go next to another.
'extremely' says to hollow out the word (remove centre letters).
'awful' with its middle removed is 'al'.
'anne'+'al'='ANNEAL'
(Other definitions for anneal that I've seen before include "Temper by heat treatment" , "Toughen by a process of gradually heating and cooling" , "Toughen by heating and slow cooling" , "toughening process" , "Long angry speech" .)