Champion disappearing act cloaks queen (10)

I believe the answer is:
vanquisher
'champion' is the definition.
(thesaurus)
'disappearing act cloaks queen' is the wordplay.
I cannot really understand how this works, but
'queen' could be 'qu' (abbreviation for queen) and 'qu' is found within the answer.
The remaining letters 'vanisher' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
I've seen this clue in The Independent.
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