In Tooting, he can get drunk on gin (4)
I believe the answer is:
otto
'in tooting he can get drunk' is the definition.
The definition suggests a singular noun which matches the answer.
'on gin' is the wordplay.
I cannot quite see how this works, but
'on' could be 'to' and 'to' is found within the answer.
The remaining letters 'ot' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for otto that I've seen before include "German emperor" , "perfume ingredient" , "that smells quite nice" , "Palindromic German name like Bismark's" , "Palindromic man's name" .)