What does the cryptic crossword clue "Restriction in first of colours, light blue (9)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Restriction in first of colours, light blue (9)

Telegraph Prize Cryptic #3128 | 24 Across | 2021-10-03 flower

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