Something often containing a single parenthesis (6)
I believe the answer is:
smiley
(Other definitions for smiley that I've seen before include "Spymaster" , "Grinning face symbol" , "Cheerful emoticon" , "sounds cheerful" .)
I've seen this clue in The New York Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.