Completely destroyed wheel-cover in African river (8)

I believe the answer is:

entirely

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'completely' is the definition.
(I know that completely can be written as entirely)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for entirely that I've seen before include "Without reservation" , "without qualification _" , "Fully or absolutely" , "Completely and absolutely" , "Wholly and completely" .)

I've seen this clue in The Irish Times.

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