Crossword Genius

Sad -- unlike this clue? (4)

Ross

I believe the answer is:

down

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for down that I've seen before include "Feathers or hair" , "Out of sorts" , "like the other set of clues" , "Depressed - drink" , "Pillow filler - dejected" .)

I've seen this clue in The Telegraph.
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