Bad-tempered beast touring Central America (6)
I believe the answer is:
morose
'bad-tempered' is the definition.
(morose means sad or in a bad mood)
'beast touring central america' is the wordplay.
'beast' becomes 'moose'.
'touring' means one lot of letters goes inside another (touring can mean going round).
'central' indicates the central letters.
The middle letter of 'america' is 'r'.
'moose' going around 'r' is 'MOROSE'.
(Other definitions for morose that I've seen before include "Sullen and brooding" , "Silent, gloomy and ill-tempered" , "Sullen or glum." , "Melancholy" , "Miserable" .)