Crossword Genius

Atomic edifice? (4)

Ross

I believe the answer is:

pile

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'edifice?' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for pile that I've seen before include "Stake" , "Heap, carpet surface" , "Nap of a carpet" , "Post" , "Large number" .)

I've seen this clue in the Evening Standard.
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