Obscure point is repeated about prunes (7)
I believe the answer is:
eclipse
'obscure' is the definition.
(I know that eclipse is a type of overshadow)
'point is repeated about prunes' is the wordplay.
'point' becomes 'e' (compass point).
'is repeated' shows that letters should be duplicated.
'about' is an insertion indicator.
'prunes' becomes 'clips' ('clip' can be a synonym of 'prune').
'e' doubled is 'ee'.
'ee' placed around 'clips' is 'ECLIPSE'.
(Other definitions for eclipse that I've seen before include "When light's dropped" , "A deliquium" , "Surpass in achievement" , "Darkening of the sun" , "Dominate - put in the shade" .)