Highballs for slipshod enthusiasts? (6)

I believe the answer is:

skiers

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'highballs' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for skiers that I've seen before include "They glide across snow for sport" , "Winter sportsmen" , "aerial shots" , "They race on snow" , "They glide on the piste" .)

I've seen this clue in The Globe and Mail.

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