Outshine, despite loss of brilliancy? (7)
I believe the answer is:
eclipse
This clue could be a double definition.
'outshine' is the first definition.
(I've seen this in another clue)
'loss of brilliancy?' is the second definition.
'eclipse' can be an answer for 'loss'. I'm unsure of the 'of brilliancy?' bit.
'despite' is the link.
Can you help me to learn more?
(Other definitions for eclipse that I've seen before include "Outdo" , "Total - - of the sun" , "The blotting out of a heavenly body" , "Astronomical event" , "Throw into shade, like a heavenly body" .)