You said nothing first about the street disturbance (6)
I believe the answer is:
unrest
'disturbance' is the definition.
(I've seen this in another clue)
'you said nothing first about the street' is the wordplay.
'you' becomes 'u' (commonly used in online communication).
'said nothing first' becomes 'ern' (I can't justify this - if you can you should believe this answer much more).
'about' shows that the letters should be reversed in order.
'the street' becomes 'st' (abbreviation).
'ern' reversed gives 'nre'.
'u'+'nre'+'st'='UNREST'
Can you help me to learn more?
(Other definitions for unrest that I've seen before include "Uneasiness; turmoil" , "Trouble" , "State of turbulence" , "Disorder" , "Discontent, disturbance" .)