What does the cryptic crossword clue "Writer on computer matters, unknown expert (9)" mean?

The definition is "expert". The wordplay uses a charade (building blocks). AUTHOR (synonym="Writer") + IT (abbreviation="computer") + Y (abbreviation="unknown") = AUTHORITY; definition: "expert" The answer is AUTHORITY.

Writer on computer matters, unknown expert (9)

Guardian Cryptic #28232 | 16 Down | 2020-09-07 flower

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