Playing hard to get (3)
I believe the answer is:
coy
'playing hard to get' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for coy that I've seen before include "Pretending shyness" , "reluctant to divulge information" , "Pretending to be shy or bashful" , "Group of soldiers" , "Demure, like Marvell's mistress" .)