Crossword Genius

I’m jumping American, but oddly I’m no ogre (8)

Ross

I believe the answer is:

geronimo

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

'i'm jumping american' is the definition.
I can't judge whether this definition defines the answer.

'oddly i'm no ogre' is the wordplay.
'oddly' is an anagram indicator.
'im'+'no'+'ogre'='imnoogre'
'imnoogre' with letters rearranged gives 'GERONIMO'.

'but' acts as a link.

Can you help me to learn more?

(Other definitions for geronimo that I've seen before include "he's called for the high jump?" , "Apache chieftain - US paratroopers war cry when jumping" , "battle cry" , "American shout on jumping out of an aeroplane?" , "shout during dive" .)

I've seen this clue in The Times and The Sunday Times.
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