Crossword Genius

Rider's request upset Scotsman (10)

Ross

I believe the answer is:

equestrian

'rider's' is the definition.
(equestrian is a kind of rider)

'request upset scotsman' is the wordplay.
'upset' indicates anagramming the letters.
'scotsman' becomes 'ian' (common Scottish name).
'request' with letters rearranged gives 'equestr'.
'equestr'+'ian'='EQUESTRIAN'

(Other definitions for equestrian that I've seen before include "Horse-rider" , "Jockey" , "Horse rider" , "Person on horseback" , "Horseman" .)

I've seen this clue in The Telegraph.
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