City's mad longing (7)

I believe the answer is:

craving

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'longing' is the definition.
(I've seen this before)

'city's mad' is the wordplay.
'city' becomes 'c' (this might be a standard abbreviation which I don't know about).
'mad' becomes 'raving' (I've seen this before).
'c'+'raving'='CRAVING'

Can you help me to learn more?

(Other definitions for craving that I've seen before include "Intense feeling of desire" , "Hunger" , "Great desire" , "Strongly desiring" , "Powerful desire" .)

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