PIN reset fraudulently after corporation identifies street urchin (11)
I believe the answer is:
guttersnipe
'street urchin' is the definition.
(I know that street urchin can be written as guttersnipe)
'pin reset fraudulently after corporation' is the wordplay.
'fraudulently' indicates anagramming the letters (a fraudulent version of the letters).
'after' says to put letters next to each other.
'corporation' becomes 'gut' (both can humorously mean belly fat).
'pin'+'reset'='pinreset'
'pinreset' is an anagram of 'tersnipe'.
'tersnipe' put after 'gut' is 'GUTTERSNIPE'.
'identifies' acts as a link.
(Other definitions for guttersnipe that I've seen before include "Person behaving as one brought up in squalor" , "Scruffy street child" , "Wretched child" , "poor kid" , "Street urchin" .)