What does the cryptic crossword clue "Regulator very vigorous? Not I (5)" mean?

The definition is "Regulator". The wordplay uses a charade (building blocks). V (synonym="very") + AL (synonym="AL") + VE (synonym="vigorous, minus I") = VALVE; definition: "Regulator" The answer is VALVE.

Regulator very vigorous? Not I (5)

Guardian Cryptic #28256 | 21 Across | 2020-10-05 flower

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