Listen, Do You Want To Know A Secret? (pop song with some terrific leads) (4)
I believe the answer is:
psst
'listen do you want to know a secret?' is the definition.
(sound used to whisper to someone)
'pop song with some terrific leads' is the wordplay.
'pop song' becomes 'ps' (this could be a standard abbreviation which I don't know about).
'with' says to put letters next to each other.
'leads' says to take the initial letters.
The first letters of 'some terrific' is 'st'.
'ps'+'st'='PSST'
Can you help me to learn more?
(Other definitions for psst that I've seen before include "Notice me" , "Call to attract attention" , "This is confidential" , "Whispered exclamation to attract attention" , "Interjection to attract someone's attention without alerting others" .)