Short movie sent up Animal House (5)
I believe the answer is:
testy
'short' is the definition.
(both can mean angry)
'movie sent up animal house' is the wordplay.
'movie' becomes 'ET'.
'sent up' is a reversal indicator.
'animal house' becomes 'sty'.
'et' reversed gives 'te'.
'te'+'sty'='TESTY'
(Other definitions for testy that I've seen before include "Irritably impatient" , "Captious" , "Cross" , "snappy" , "Quick to anger" .)