Crossword Genius

Blue swallow (4)

Ross

I believe the answer is:

down

This clue is a double definition.

'blue' is the first definition.
(both can mean sad)

'swallow' is the second definition.
(I've seen this before)

(Other definitions for down that I've seen before include "Unhappy; soft feathers" , "Melancholy" , "somewhere in Northern Ireland to > drink" , "Out of sorts" , "In a low mood; hill" .)

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