Crossword Genius

Run of birdsong (5)

Ross

I believe the answer is:

trill

(Other definitions for trill that I've seen before include "Fast alternation of notes" , "Ornament" , "Rapid alternation of notes" , "Warbling sound made by a songbird" , "High-pitched warbling sound" .)

I've seen this clue in the Sydney Morning Herald.
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