Crossword Genius

Being just partly found out can be one's downfall! (4)

Ross

I believe the answer is:

undo

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'being just partly found out can be one's downfall' is the definition.
I can't judge whether this defines the answer.

'one's downfall' is the wordplay.
'one' becomes 'un' (I've seen this in other clues).
'downfall' becomes 'do' (I can't justify this - if you can you should give a lot more credence to this answer).
'un'+'do'='UNDO'

Can you help me to learn more?

(Other definitions for undo that I've seen before include "Bring to ruin" , "Subvert" , "set free" , "Untie or ruin" , "Unfasten, loosen" .)

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