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How gravely injured is an oversized confederate? (7)

Ross

I believe the answer is:

fatally

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'how gravely injured is an' is the definition.
I can't tell whether this defines the answer.

'oversized confederate?' is the wordplay.
'oversized' becomes 'fat' (I am not sure about this - if you are sure you should believe this answer much more).
'confederate?' becomes 'ally' (synonyms).
'fat'+'ally'='FATALLY'

Can you help me to learn more?

(Other definitions for fatally that I've seen before include "with no hope of revival" , "Mortally" , "producing disastrous result" , "So as to cause death" , "Might one be wounded thus" .)

I've seen this clue in The Irish News.
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