Tease about new style (4)
I believe the answer is:
kind
'style' is the definition.
(I've seen this before)
'tease about new' is the wordplay.
'tease' becomes 'kid' (kid can mean to tease or joke).
'about' is an insertion indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'kid' going around 'n' is 'KIND'.
(Other definitions for kind that I've seen before include "Benevolent - sort" , "Generous - type" , "Friendly - type" , "Class, type" , "Good-natured" .)