Street urchin to start to go out with bird (11)
I believe the answer is:
guttersnipe
'street urchin' is the definition.
(thesaurus)
'start to go out with bird' is the subsidiary indication.
'start to go out' becomes 'gutter' (as in a candle flame).
'with' says to put letters next to each other.
'bird' becomes 'snipe' (snipe is a kind of bird).
'gutter'+'snipe'='guttersnipe'
'to' is the link.
(Other definitions for guttersnipe that I've seen before include "poor kid" , "(Neglected) child of the streets" , "Scruffy street child" , "Street urchin" , "Wretched child" .)