Surpass a celestial event (7)
I believe the answer is:
eclipse
I believe this is a double definition.
'surpass' is the first definition.
(eclipsing is a kind of surpassing)
'a celestial event' is the second definition.
(I've seen this in another clue)
(Other definitions for eclipse that I've seen before include "Ennui" , "Heavenly phenomenon" , "Celestial obscuration of light" , "The blocking of light of one heavenly body by another" , "Heavenly obscuration" .)