Name that’s seen on door? (6)
I believe the answer is:
handle
This clue is a double definition.
'name' is the first definition.
(a handle is a name)
'that's seen on door?' is the second definition.
(door handle)
(Other definitions for handle that I've seen before include "Person's name (slang)" , "Grip, hold" , "Manage - touch - hilt" , "Part by which something is held" , "Feel or manipulate" .)