Threat from icy ruts — skier upset (8,4)
I believe the answer is:
security risk
'threat' is the definition.
(both pose a danger)
'icy ruts skier upset' is the wordplay.
'upset' indicates an anagram.
'icy'+'ruts'+'skier'='icyrutsskier'
'icyrutsskier' anagrammed gives 'SECURITY RISK'.
'from' acts as a link.
(Another definition for security risk that I've seen is " One likely to divulge state secrets".)
I've seen this clue in The Times.
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