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In the event, an equestrian garment? (6)

Ross

I believe the answer is:

jumper

I'm a little stuck... Click here to teach me more about this clue!

'equestrian garment?' is the definition.
'jumper' can be an answer for 'garment?' (jumper is a kind of garment). I am unsure of the 'equestrian' bit.

'in the event an' is the wordplay.
'in the event' becomes 'jum' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'an' becomes 'per' (synonymous as in 'once an hour', 'once per hour').
'jum'+'per'='JUMPER'

Can you help me to learn more?

(Other definitions for jumper that I've seen before include "Kangaroo and knitted garment" , "Knitwear - bounder" , "field athlete" , "Top" , "that may be long for an athlete" .)

I've seen this clue in the Evening Standard.
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