Part of a typewriter to cover with thin metal bearing (6)
I believe the answer is:
platen
'part of a typewriter' is the definition.
(I've seen this in another clue)
'with thin metal bearing' is the wordplay.
'with thin' becomes 'plat' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'metal' becomes 'E' (E is an example).
'bearing' becomes 'N' (north is a compass bearing).
'plat'+'e'+'n'='PLATEN'
'to cover' is the link.
Can you help me to learn more?
(Other definitions for platen that I've seen before include "One working in the press" , "Roller against which typewriter keys strike - ten lap (anag)" .)