Pixieish (5)
I believe the answer is:
elfin
'pixieish' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elfin that I've seen before include "Resembling one of the little people" , "Pixie-like" , "Dainty" , "Delicately framed" , "Little, charming and naughty" .)