Crossword Genius

Did advocate impeach Don "incorrectly"? (10)

Ross

I believe the answer is:

championed

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

'did advocate' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how one could define the other.

'impeach don incorrectly?' is the wordplay.
'incorrectly?' indicates an anagram (I've seen 'incorrectly' mean this (I've seen this in other clues)).
'impeach'+'don'='impeachdon'
'impeachdon' anagrammed gives 'CHAMPIONED'.

Can you help me to learn more?

(Another definition for championed that I've seen is " Was supportive".)

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