Sportsperson riding eleven terrifying tackles (7)

I believe the answer is:

eventer

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'sportsperson' is the definition.

'riding eleven terrifying tackles' is the wordplay.
'EVENTER' is hidden within the letters.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for eventer that I've seen before include "Rider in contests" , "Jumper" , "Competitive horse/rider" , "Equestrian competitor" , "competitive horse" .)

I've seen this clue in The Telegraph.

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