Type of printer (6)
'type of printer' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for inkjet that I've seen before include "Type of electronic printing" , "Kind of printer" , "and 20 Across: Type of computer accessory" , "Type of office printer" , "Printer powered by a liquid engine" .)
'type of printer' is the definition.
This is all the clue.