Hot over Germany — many left Hitler for what he was (9)

I believe the answer is:

warmonger

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'many left hitler for what he was' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'hot over germany' is the wordplay.
'hot' becomes 'warm' (synonyms).
'over' becomes 'on' (physically on top of).
'germany' becomes 'ger' (I've seen this in other clues).
'warm'+'on'+'ger'='WARMONGER'

Can you help me to learn more?

(Other definitions for warmonger that I've seen before include "Hawk" , "Hitler, perhaps" , "Aggressor" , "Bellicose person" , "Belligerent person" .)

I've seen this clue in The Hindu.

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