Crossword Genius

Born again Hitlerite, but he’s mostly just gas (3-4)

Ross

I believe the answer is:

neo-nazi

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'he's mostly just gas' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'born again hitlerite' is the wordplay.
'born again' becomes 'neo' (I can't explain this - if you can you should give a lot more credence to this answer).
'hitlerite' becomes 'nazi' (I've seen this before).
'neo'+'nazi'='NEO-NAZI'

'but' is the link.

Can you help me to learn more?

(Other definitions for neo-nazi that I've seen before include "Modern disciple of Hitler" , "Extreme nationalist" , "Modern Hitlerite" .)

I've seen this clue in the Evening Standard.
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