Constellation bear (4)
I believe the answer is:
ursa
'constellation bear' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ursa that I've seen before include "It's both major anf minor overhead" , "(and 11 across) Pole Star constellation" , "__ Minor, the Little Bear" , "(In the sky) Major or Minor" , "Major and Minor, the Bear constellations" .)