This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A guide; an escort.

n. One that goes in advance; a forerunner.

n. A mounted attendant who rides in front of or beside a carriage.

n. A guide or escort, especially one who rides in advance

n. A summoner whose office is to cite men before the sheriff.

n. One who rides out on horseback, beyond the main group, e. g., as a scout.

n. A servant on horseback attending a carriage.

n. One who rides out or forth.

n. A person on horseback, especially a servant, who precedes or accompanies a carriage.

n. One who is in the habit of riding out for pleasure.

n. A highwayman.

n. A commercial traveler.

n. an escort who rides ahead (as a member of the vanguard)

"These days it seems carrying a party card does not disqualify you from being an outrider for a Tory government."

escort    bodyguard   

vanguard   

bunched-up    Jehu    scullery-maid    hackle    turtleback    kitchenmaid    hostler    postillion    waggoner