Sound of giggling disturbing real thug (8)
I believe the answer is:
laughter
This clue could be a double definition.
'sound' is the first definition.
(I have seen 'Sound of merriment' mean 'laughter' so perhaps 'sound' could also mean 'laughter')
'giggling disturbing real thug' is the second definition.
'laughter' can be an answer for 'giggling'. I'm unsure of the 'disturbing real thug' bit.
'of' is the link.
Can you help me to learn more?
(Other definitions for laughter that I've seen before include "A manifestation of joy" , "Manifestation of amusement" , "Cackling" , "The expression of lively amusement" , "It's said to be the best medicine" .)