Bird, duck, on turbulent Loire (6)
I believe the answer is:
oriole
'bird' is the definition.
(oriole is a kind of bird)
'duck on turbulent loire' is the wordplay.
'duck' becomes 'o'.
'on' is an insertion indicator.
'turbulent' indicates anagramming the letters.
'loire' anagrammed gives 'orile'.
'o' inserted within 'orile' is 'ORIOLE'.
(Other definitions for oriole that I've seen before include "(Tropical or American) songbird" , "Did Leo or I hear the tropical songbird?" , "Black and yellow US bird" , "Flyer" , "Oil ore, strangely, for the songbird" .)