What does the cryptic crossword clue "Judah's son up and back in extremely short period (10)" mean?

The definition is "extremely short period". The wordplay uses a reversal. ONAN (reversal="ONAN") + SECOND (synonym="back") = NANOSECOND; definition: "extremely short period" The answer is NANOSECOND.

Judah's son up and back in extremely short period (10)

Times Cryptic #28984 | 8 Down | 2024-08-01 flower

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