Bloody unusual (4)
I believe the answer is:
rare
I believe this clue is a double definition.
'bloody' is the first definition.
(I've seen this before)
'unusual' is the second definition.
(thesaurus)
(Other definitions for rare that I've seen before include "Might a four-leaf clover be so" , "Not often seen - underdone" , "Exceptional" , "Meat that's lightly cooked" , "Very, very occasional" .)