Online laughs with a girl (4)
I believe the answer is:
lola
'girl' is the definition.
'online laughs with a' is the wordplay.
'online laughs' becomes 'lol' (I am not sure about this - if you are sure you should believe this answer much more).
'with' means one lot of letters go next to another.
'lol'+'a'='LOLA'
Can you help me to learn more?
(Other definitions for lola that I've seen before include "Whatever -- wants (song); -- Montez, mistress of Ludwig I" , "song by 4 [THE KINKS]" .)