Crossword Genius

In morning Naomi lively, a gas! (7)

Ross

I believe the answer is:

ammonia

I'm a little stuck... Click here to teach me more about this clue!

'a gas' is the definition.
(ammonia is a kind of gas)

'in morning naomi lively' is the wordplay.
'in morning' becomes 'am' (as in 12:00 AM. I am not sure about the 'in' bit.).
'lively' indicates an anagram (letters get livened up or moved around).
'naomi' anagrammed gives 'monia'.
'am'+'monia'='AMMONIA'

Can you help me to learn more?

(Other definitions for ammonia that I've seen before include "Pungent cleaning fluid" , "pungent chemical" , "Pungent gas used in cleaning liquids" , "Colourless gas with strong smell" , "compound?" .)

I've seen this clue in The Times.
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