Polish initially reviled in The Sun? (6)
I believe the answer is:
shiner
'the sun?' is the definition.
(something which shines)
'polish initially reviled' is the wordplay.
'polish' becomes 'shine' ('shine' can be a synonym of 'polish').
'initially' suggests taking the first letters.
The first letter of 'reviled' is 'r'.
'shine'+'r'='SHINER'
'in' is the link.
(Other definitions for shiner that I've seen before include "Light" , "What one might get from boxer" , "Informally, a black eye" , "Slang for a black-eye" , "Mouse" .)