Take stock for reform in Ulster (6)
I believe the answer is:
rustle
'take stock' is the definition.
(rustle can mean to steal cattle or stock)
'reform in ulster' is the wordplay.
'ulster' anagrams to 'RUSTLE'.
Though, I'm not clear how this is indicated.
'for' is the link.
Can you help me to learn more?
(Other definitions for rustle that I've seen before include "Steal ((eg, cattle)" , "Low sound of rubbing" , "Steal (cattle, etc)" , "Steal cattle in the old West" , "Dry crackling sound" .)