Crossword Genius

Insurance, as in the field of sport (5)

Ross

I believe the answer is:

cover

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for cover that I've seen before include "Conceal, screen" , "Lid or shelter" , "Mask, hide" , "Extend over (an area)" , "Protect - insure" .)

I've seen this clue in the Evening Standard.
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