Crossword Genius

Depressingly indecent? (4)

Ross

I believe the answer is:

blue

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'indecent?' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for blue that I've seen before include "Turquoise, say" , "over-extravagant" , "Glum, sad" , "Unsuitable for young" , "Down in the mouth" .)

I've seen this clue in The Irish Independent.
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