Tease playfully (5)
I believe the answer is:
flirt
'tease playfully' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for flirt that I've seen before include "Coquet" , "Flutter one's eyelashes?" , "Engage lightheartedly in amorous banter" , "Dalliance" , "Philander(er)" .)