Curt, put bar off (6)
I believe the answer is:
abrupt
'curt' is the definition.
(both can mean rudely brief)
'put bar off' is the wordplay.
'off' is an anagram indicator.
'put'+'bar'='putbar'
'putbar' is an anagram of 'ABRUPT'.
(Other definitions for abrupt that I've seen before include "using minimal language?" , "Impolite" , "Rough and quick" , "Unexpected - terse" , "Sudden; precipitous" .)