Ballpoint pen brand (4)
I believe the answer is:
biro
'ballpoint pen brand' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for biro that I've seen before include "Lazlo -, ballpoint pen inventor" , "Laszlo Jozsef -, ballpoint pen inventor" , "writer" , "Writing implement" , "Type of ballpoint pen" .)