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Oscar winner Charles's cycling assault (9)

Ross

I believe the answer is:

onslaught

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'assault' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for onslaught that I've seen before include "Aggressive action" , "Fierce attack" , "Hunt goals (anag) - offensive" , "Heavy attack" , "Assault" .)

I've seen this clue in The Times.
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