Driving impatiently in South London? It's commonplace (7)
I believe the answer is:
tooting
'driving impatiently' is the definition.
Although both the answer and definition are present participle verbs, I can't see how they can define each other.
'in south london? it's commonplace' is the wordplay.
I cannot quite see how this works, but
'in' is present in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tooting that I've seen before include "S. London district" , "South London area" , "Showing impatience on road" , "Evidence of impatient motorist" , "somewhere in London?" .)