Urchin drains pine off (11)
I believe the answer is:
guttersnipe
'urchin' is the definition.
(I know that guttersnipe is a type of urchin)
'drains pine off' is the wordplay.
'drains' becomes 'gutters' (I can't justify this - if you can you should believe this answer much more).
'off' indicates anagramming the letters.
'pine' is an anagram of 'nipe'.
'gutters'+'nipe'='GUTTERSNIPE'
Can you help me to learn more?
(Other definitions for guttersnipe that I've seen before include "(Neglected) child of the streets" , "Street urchin" , "Scruffy street child" , "Person behaving as one brought up in squalor" , "poor kid" .)