They're not often miscast in Westerns (7)

I believe the answer is:

lariats

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'westerns' is the definition.
Although both the answer and definition are plural nouns, I cannot understand how they can define each other.

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

Can you help me to learn more?

(Other definitions for lariats that I've seen before include "Long noosed ropes" , "Animal tethers" , "Lasso ropes" , "Lassos" .)

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

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