Bear in two constellation names (4)
I believe the answer is:
ursa
'bear in two constellation names' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ursa that I've seen before include "Constellation (Major or Minor)" , "__ Minor, the Little Bear" , "It's both major anf minor overhead" , "and 18 Down: The Great Bear" , "Major/Minor constellation" .)