Call for attention when sounding drunk (4)

I believe the answer is:
psst
'call for attention' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for psst that I've seen before include "(Whispered) may I have your attention?" , "Sound of call to hear a secret" , "Interjection to draw attention" , "Sibilant sound made to attract attention" , "attempt to attract attention" .)
