What does the cryptic crossword clue "Online reference needing number and name (7)" mean?

The definition is "Online reference". The wordplay uses a charade (building blocks). HASH (synonym="number") + TAG (synonym="name") = HASHTAG The answer is HASHTAG.

Online reference needing number and name (7)

Guardian Cryptic #29342 | 19 Down | 2024-03-28 flower

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