What does the cryptic crossword clue "A builder of nest behind barrier, firm (7)" 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.

A builder of nest behind barrier, firm (7)

Guardian Cryptic #29885 | 15 Across | 2025-12-23 flower

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