Thieving, clear off - common sense (9)
I believe the answer is:
larcenous
'thieving' is the definition.
(I've seen this before)
'clear off common sense' is the wordplay.
'off' indicates an anagram.
'common sense' becomes 'nous' (nous is a kind of common sense).
'clear' is an anagram of 'larce'.
'larce'+'nous'='LARCENOUS'
(Other definitions for larcenous that I've seen before include "concerning certain crimes" , "Criminal" , "Related to theft" , "Inclined to appropriate" , "thieving" .)