Brilliant finish in outskirts of Czech capital (6)
I believe the answer is:
chrome
'brilliant finish' is the definition.
(I've seen this before)
'outskirts of czech capital' is the wordplay.
'outskirts of' suggests removing the centre (only letters on the outskirts).
'capital' becomes 'rome' (capital of Italy).
'czech' with its middle removed is 'ch'.
'ch'+'rome'='CHROME'
'in' acts as a link.
(Other definitions for chrome that I've seen before include "Plate (for bathroom fixtures etc)" , "A yellow colouring matter" , "'Silvery metal, resists tarnishing (6)'" , "Metal plating - type of yellow" , "Feature of bath taps" .)