Participants in equestrian competitions never set off (8)

I believe the answer is:

eventers

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'participants in equestrian competitions' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'never set off' is the wordplay.
'off' indicates anagramming the letters.
'never'+'set'='neverset'
'neverset' anagrammed gives 'EVENTERS'.

Can you help me to learn more?

(Another definition for eventers that I've seen is " Horse riders".)

I've seen this clue in The Times.

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