Ancient Mesopotamian deity, left in back row (5)

I believe the answer is:

enlil

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'ancient mesopotamian deity' is the definition.
'Enlil' can be an answer for 'deity' (Enlil is an example). I'm not sure about the 'ancient mesopotamian' bit.

'left in back row' is the wordplay.
'left' becomes 'L' (common abbreviation).
'in' means one lot of letters goes inside another.
'back' says the letters should be written in reverse.
'row' becomes 'line' (I've seen this in another clue).
'line' written backwards gives 'enil'.
'l' inserted into 'enil' is 'ENLIL'.

Can you help me to learn more?

I've seen this clue in The Hindu.

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