What does the cryptic crossword clue "Sequence obtained from irrational number like 1.618...? (5)" mean?

The definition is "number like 1.618…?". The wordplay uses a hidden word. Hidden in [ sequence obtained from ] "ir RATIO nal" 1.618… is the golden ratio, a ratio important in mathematics and geometry. The answer is RATIO.

Sequence obtained from irrational number like 1.618...? (5)

Guardian Cryptic #29335 | 2 Down | 2024-03-20 flower

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