Drunkard finding nothing in street (3)
I believe the answer is:
sot
'drunkard' is the definition.
('sot' can be a synonym of 'drunkard')
'nothing in street' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'in' means one lot of letters goes inside another.
'street' becomes 'st' (**).
'o' placed within 'st' is 'SOT'.
'finding' acts as a link.
(Other definitions for sot that I've seen before include "Lush" , "Habitual drunkard" , "One's often intoxicated" , "Toper" , "drunk" .)