Rebel in city starts to trash everything and rob (6)
I believe the answer is:
rioter
'rebel' is the definition.
(I've seen this before)
'city starts to trash everything and rob' is the wordplay.
'city' becomes 'Rio' (Rio de Janeiro).
'starts to' indicates taking the first letters.
'and' means one lot of letters go next to another.
'rob' becomes 'r' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The initial letters of 'trash everything' is 'te'.
'rio'+'te'+'r'='RIOTER'
'in' is the link.
Can you help me to learn more?
(Other definitions for rioter that I've seen before include "One involved in civil unrest" , "One of a violent crowd" , "He's running amok in the street" , "One of a crowd involved in wild disturbance" , "Disturber of the peace, looter" .)