30 across
Mountains
figure
in
Aspen
resort
(9)
Mountains figure in Aspen resort (9)
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The definition is at the beginning of the clue.
How the clue works
Look at Mountains — that's your definition, pointing you to the Italian range. You take Aspen and anagram it (resort doing the signalling) to get APEN...S, then you insert NINE (a figure) into the middle of that to give you APEN + NINE + S.