What does the cryptic crossword clue "Corroborate in accordance with common authentication method (8)" mean?

The definition is "Corroborate". The wordplay uses a charade (building blocks). UNDER (synonym="in accordance with") + PIN (synonym="Personal Identification Number – common authentication method") = UNDERPIN; definition: "Corroborate" The answer is UNDERPIN.

Corroborate in accordance with common authentication method (8)

Guardian Cryptic #29294 | 7 Down | 2024-02-01 flower

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