Left Arab slum at a slowish pace (9)

I believe the answer is:

larghetto

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'at a slowish pace' is the definition.
I can't judge whether this definition defines the answer.

'left arab slum' is the wordplay.
'left' becomes 'L' (common abbreviation).
'arab' becomes 'ar' (abbreviation in reference works).
'slum' becomes 'ghetto' (I've seen this before).
'l'+'ar'+'ghetto'='LARGHETTO'

Can you help me to learn more?

(Other definitions for larghetto that I've seen before include "Rather slow" , "In a fairly slow tempo (>music)" , "Somewhat slow (music)" , "rather slowly" , "movement" .)

I've seen this clue in The Daily Mail.

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