Unleash anger, upset to find such farming practice (4-5)
I believe the answer is:
free-range
'farming practice' is the definition.
'unleash anger upset' is the wordplay.
'unleash' becomes 'free'.
'upset' is an anagram indicator.
'anger' is an anagram of 'range'.
'free'+'range'='FREE-RANGE'
'to find such' is the link.
(Other definitions for free-range that I've seen before include "Allowed freedom of movement, chickens say" , "Not battery farmed" , "Non-battery" .)