Snoop quietly online (3)
I believe the answer is:
pry
'snoop' is the definition.
(I've seen this in another clue)
'quietly online' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'online' becomes 'ry' (I can't explain this - if you can you should give a lot more credence to this answer).
'p'+'ry'='PRY'
Can you help me to learn more?
(Other definitions for pry that I've seen before include "Intrusively enquire" , "Enquire too inquisitively" , "Be inquisitive" , "Be nosey" , "Snoop or lever" .)