What does the cryptic crossword clue "Principal set up computer (9)" mean?

The definition is "computer". The wordplay uses a charade (building blocks). MAIN (synonym of "Principal") + FRAME (synonym of "set up"); definition: "computer" The answer is MAINFRAME.

Principal set up computer (9)

Guardian Cryptic #29142 | 24 Across | 2023-08-07 flower

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