Crossword Genius

Warble or croon (4)

Ross

I believe the answer is:

sing

I believe this is a double definition.

'warble' is the first definition.
(I know that warble is a more specific form of sing)

'croon' is the second definition.
(I know that croon is a more specific form of sing)

(Other definitions for sing that I've seen before include "Chorus" , "Make melodious sounds with voice" , "Grass" , "Perform (a song)" , "pipe" .)

I've seen this clue in The Times.
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