Bird an impatient landlord might hope to secure? (8)

I believe the answer is:

swiftlet

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'landlord might hope to secure?' is the definition.
I can't judge whether this defines the answer.

'bird an impatient' is the wordplay.
'bird' becomes 'swift' (swift is a kind of bird).
'an impatient' becomes 'let' (I can't explain this - if you can you should believe this answer much more).
'swift'+'let'='SWIFTLET'

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I've seen this clue in The Times.

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