Steal cattle, perhaps, with terrible result (6)
I believe the answer is:
rustle
'steal cattle' is the definition.
(I've seen this before)
'terrible result' is the wordplay.
'terrible' indicates an anagram.
'result' is an anagram of 'RUSTLE'.
'perhaps with' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for rustle that I've seen before include "making little noise" , "Steal stock" , "take animals" , "Whisper softly" , "Make sound as of paper crumpling - or steal cattle" .)