What does the cryptic crossword clue "Feature of numbers with natural base (4)" mean?

The definition is "Feature". The wordplay uses a charade (building blocks). NOS (synonym="numbers") + E (synonym="natural base") = NOSE; definition: "Feature" The answer is NOSE.

Feature of numbers with natural base (4)

Guardian Cryptic #29101 | 26 Down | 2023-06-20 flower

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