What does the cryptic crossword clue "Helium and nitrogen layer (3)" mean?

The definition is "layer". The wordplay uses a charade (building blocks). HE (abbreviation="Helium") + N (abbreviation="nitrogen") = HEN; definition: "layer" The answer is HEN.

Helium and nitrogen layer (3)

Daily Mail Cryptic #16356 | 11 Across | 2020-07-10 flower

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