Checks about polishes (7)
I believe the answer is:
rebuffs
'checks' is the definition.
(I've seen this before)
'about polishes' is the wordplay.
'about' becomes 're' (regarding).
'polishes' becomes 'buffs' (buffing is a kind of polishing).
're'+'buffs'='REBUFFS'
(Other definitions for rebuffs that I've seen before include "Snubs" , "Checks" , "Rejects outright and bluntly" , "Rejects abruptly" , "Brushes off" .)