Surpass a celestial occurrence (7)
I believe the answer is:
eclipse
This clue could be a double definition.
'surpass' is the first definition.
(eclipsing is a kind of surpassing)
'a celestial occurrence' is the second definition.
'eclipse' can be an answer for 'occurrence' (eclipse is a kind of occurrence). I am not certain of the 'a celestial' bit.
Can you help me to learn more?
(Other definitions for eclipse that I've seen before include "concealment" , "Obscure light from (other celestial body)" , "Obscuring of a heavenly body" , "Block" , "Throw into shade, like a heavenly body" .)