What does the cryptic crossword clue "Pile sodium on top of phosphorous (3)" mean?

The definition is "Pile". The wordplay uses a charade (building blocks). NA (abbreviation="sodium") + P (first_letter="phosphorous") = NAP; definition: "Pile" The answer is NAP.

Pile sodium on top of phosphorous (3)

Daily Mail Cryptic #16851 | 25 Down | 2022-06-03 flower

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