The impressive kind? (4)
I believe the answer is:
type
'kind?' is the definition.
(I know that type is a type of kind)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for type that I've seen before include "of a certain kind" , "Sort, variety" , "Produce characters" , "Write using a keyboard" , "key" .)