Polish once again getting snub (6)
I believe the answer is:
rebuff
I believe this clue is a double definition.
'polish once again' is the first definition.
(to buff again)
'snub' is the second definition.
(I know that snub can be written as rebuff)
'getting' acts as a link.
(Other definitions for rebuff that I've seen before include "Check" , "Unexpected and blunt refusal" , "Cold-shoulder" , "Reject bluntly" , "Reject in an ungrateful manner" .)