What does the cryptic crossword clue "Calculator's standard on decline (5,4)" mean?

The definition is "Calculator". The wordplay uses a charade (building blocks). SLIDE (synonym="slide") + RULE (synonym="standard") = SLIDE RULE; definition: "Calculator's" The answer is SLIDE RULE.

Calculator's standard on decline (5,4)

Times Cryptic #29192 | 9 Across | 2025-04-01 flower

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