Cryptic caves

Can I ask for an explanation? I get bits of it (BG and MEAN), so it was clear that the answer was Big Meanie - I just couldn't quite get to the full solution. Ta.
<pedant mode> I'm wondering if tritim230 is confusing "eg" (exempli gratia = "for example") with "ie" (id est = "that is") </pedant mode>😇
 
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