Cave in western America - I'm unsure about measure of the volume and breadth (7)

Guardian Cryptic #29280 | 5 Across | 2024-01-16
Generating...

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

A reversal (‘western’) of US (American) + UM (I’m not sure) round CC (measure of volume) + B (breadth)

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