Blair dared to transform aid to keep seafarer afloat (3,7)
I believe the answer is:
air bladder
'aid to keep seafarer afloat' is the definition.
(type of flotation device)
'blair dared to transform' is the wordplay.
'to transform' is an anagram indicator.
'blair'+'dared'='blairdared'
'blairdared' with letters rearranged gives 'AIR-BLADDER'.
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