Infant lion injured an ancient Mesopotamian (10)

I believe the answer is:

babylonian

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'ancient mesopotamian' is the definition.
The definition suggests a singular noun which matches the answer.

'infant lion injured an' is the wordplay.
'infant' becomes 'baby' (synonyms).
'injured' indicates anagramming the letters.
'lion' is an anagram of 'loni'.
'baby'+'loni'+'an'='BABYLONIAN'

Can you help me to learn more?

(Other definitions for babylonian that I've seen before include "From the old city" , "Old citizen" .)

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

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