One taking stock of extraordinary result, right? (7)
I believe the answer is:
rustler
'one taking stock' is the definition.
(someone stealing farm animals ie stock)
'extraordinary result right?' is the wordplay.
'extraordinary' is an anagram indicator.
'right?' becomes 'r' (abbreviation).
'result' anagrammed gives 'rustle'.
'rustle'+'r'='RUSTLER'
'of' acts as a link.
(Other definitions for rustler that I've seen before include "Livestock thief" , "Horse thief" , "Cattle thief" , "Cattle stealer" , "person taking stock" .)