Metal pane, perhaps one attached to a door (9)
I believe the answer is:
nameplate
'one attached to a door' is the definition.
I can't judge whether this defines the answer.
'metal pane perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'metal'+'pane'='metalpane'
'metalpane' is an anagram of 'NAMEPLATE'.
Can you help me to learn more?
(Other definitions for nameplate that I've seen before include "for handle at entrance" , "One identifies" , "It may be attached to an office door" , "Notice telling who is the occupant" , "sign of ownership" .)