Unusual strains - damn birds! (4,7)
I believe the answer is:
sand martins
'birds' is the definition.
(sand martin is a kind of bird)
'unusual strains damn' is the wordplay.
'unusual' indicates anagramming the letters.
'strains'+'damn'='strainsdamn'
'strainsdamn' with letters rearranged gives 'SAND MARTINS'.
I've seen this clue in The Daily Express.
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