Segregation arranged for dragon-slayer (5,6)
I believe the answer is:
saint george
'dragon-slayer' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'segregation arranged' is the wordplay.
'arranged' is an anagram indicator.
'segregation' with letters rearranged gives 'SAINT GEORGE'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for saint george that I've seen before include "Legendary dragon-slayer" , "Patron of several countries including England and Ethiopia" , "Dragon slayer" , "Henry's patron" , "Martyr" .)