Decimal base (3)

I believe the answer is:

ten

'decimal base' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ten that I've seen before include "Very young" , "X-WORD" , "time" , "Cardinal number" , "Half a score" .)

I've seen this clue in The Wall Street Journal, The Mirror, the LA Times, the Penny Press and the King Feature Syndicate.

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