Get over being bad-tempered (5)
I believe the answer is:
cross
I believe this clue is a triple definition!
'get' is the first definition.
(thesaurus)
'over' is the second definition.
(thesaurus)
'being bad-tempered' is the third definition.
('cross' can be a synonym of 'bad-tempered')
(Other definitions for cross that I've seen before include "Irate" , "Pass from the wing to the penalty area" , "Annoyed; hybrid" , "Stand in the way of" , "Mongrel" .)