Polish to perform superbly (5)
I believe the answer is:
shine
This clue is a double definition.
'polish' is the first definition.
(I know that polish can be written as shine)
'perform superbly' is the second definition.
(I've seen this in another clue)
'to' is the link.
(Other definitions for shine that I've seen before include "Give out or reflect light" , "Glint" , "Lustre" , "Glimmer" , "Direct (a torch) somewhere" .)