Ski resort in Colorado (5)
I believe the answer is:
aspen
'ski resort in colorado' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aspen that I've seen before include "ski resort in America?" , "winter resort" , "Trembler" , "Very timid" , "The tree that shivers in the slightest wind" .)