Key in style (4)
I believe the answer is:
type
This clue is a double definition.
'key' is the first definition.
(I've seen this before)
'style' is the second definition.
(thesaurus)
'in' is the link.
(Other definitions for type that I've seen before include "Sort; printed letters" , "Character" , "Write using a keyboard" , "Category; use keyboard" , "Sort, variety" .)