Truncated fancy bra raised temperature (6)
I believe the answer is:
abrupt
'truncated' is the definition.
(unexpectedly shortened)
'fancy bra raised temperature' is the wordplay.
'fancy' is an anagram indicator.
'raised' becomes 'up' (similar in meaning).
'temperature' becomes 't' (abbreviation).
'bra' anagrammed gives 'abr'.
'abr'+'up'+'t'='ABRUPT'
(Other definitions for abrupt that I've seen before include "Brusque, curt" , "Hurried or curt" , "Sudden; precipitous" , "without warning" , "Curt; precipitous" .)