Crossword Genius

In Greek valley find speed like frequent drunk (11)

Ross

I believe the answer is:

intemperate

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'frequent drunk' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I can't see?

'in greek valley find speed' is the wordplay.
'greek valley' becomes 'tempe'.
'find' says to put letters next to each other.
'speed' becomes 'rate' (the speed at which something happens).
'in'+'tempe'+'rate'='INTEMPERATE'

'like' is the link.

Can you help me to learn more?

(Other definitions for intemperate that I've seen before include "indulging to excess" , "Drinking alcohol to excess" , "wild" , "unrestrained" , "consuming alcohol to excess" .)

I've seen this clue in the Sydney Morning Herald.
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