Blue dye on white nylon tops (4)

I believe the answer is:

down

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

'dye on white nylon tops' is the wordplay.
'tops' says to take the initial letters.
The initial letters of 'dye on white nylon' is 'DOWN'.

(Other definitions for down that I've seen before include "Not working (computer)" , "Depressed - feathers" , "floor" , "Out of sorts" , "Soft feathers; direction" .)

I've seen this clue in The Irish Times and The Guardian.

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