Piñata feature (5)
I believe the answer is:
tilde
'pinata feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tilde that I've seen before include "Mark over the letter 'n' in Spanish" , "what Spanish writing requires" , "Spanish accent sign" , "Augmentation of text" , "Mark, sometimes on keyboards" .)