Reveal top competitive rider (10)

I believe the answer is:

showjumper

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'competitive rider' is the definition.
'showjumper' can be an answer for 'rider' (showjumper is a type of horse rider). I'm unsure of the 'competitive' bit.

'reveal top' is the wordplay.
'reveal' becomes 'show' (synonyms).
'top' becomes 'jumper' (type of garment worn as a top).
'show'+'jumper'='SHOWJUMPER'

Can you help me to learn more?

(Other definitions for showjumper that I've seen before include "Sportsperson penalised for a refusal" , "horse" , "one tackling obstacles in due course" , "performer in event" , "one using mount?" .)

I've seen this clue in The Times.

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