Deprive of prominence (7)
I believe the answer is:
eclipse
'deprive of prominence' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for eclipse that I've seen before include "A deliquium" , "Block" , "Darkening of the sun" , "Throw into shade, like a heavenly body" , "Obscure, as moon may the sun" .)