Bird hampered insect after overturning stacks (6)

I believe the answer is:
ynambu
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for ynambu that I've seen before include "S American bird" , "Large animal" .)
I've seen this clue in The Times and The Sunday Times.
Want a hint initially instead of a full solution?
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