What does the cryptic crossword clue "Small bird and an enormous one (5)" 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.

Small bird and an enormous one (5)

Telegraph #27810 | 3 Down | 2015-05-25 flower

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Also seen in

Guardian Cryptic #27227 (2017-06-19)