South Carolina mounts western trophies (6)

I believe the answer is:

scalps

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'western trophies' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.

'south carolina mounts' is the wordplay.
'south carolina' becomes 'sc'.
'mounts' becomes 'alps' (alp is a kind of mount).
'sc'+'alps'='SCALPS'

Can you help me to learn more?

(Other definitions for scalps that I've seen before include "Skins from top of heads" , "Hirsute trophies taken in battle by early native Americans" .)

I've seen this clue in The Guardian.

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