Crossword Genius

What's Hornblower doing in the suburbs? (7)

Ross

I believe the answer is:

tooting

I'm a little stuck... Click here to teach me more about this clue!

'doing in the suburbs?' is the definition.
Although both the answer and definition are present participle verbs, I cannot see how one could define the other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tooting that I've seen before include "London suburb" , "part of our capital" , "area south of Wandsworth" , "... what impatient motorist may be doing" , "South London area" .)

I've seen this clue in the Evening Standard.
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