Crossword Genius

Sorry the cake was a failure (3)

Ross

I believe the answer is:

sad

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

'sorry' is the definition.
(I know that sorry can be written as sad)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sad that I've seen before include "Disconsolate" , "Melancholy or pitiful" , "Effect of winter darkness" , "Regrettable" , "Miserable" .)

I've seen this clue in the Evening Standard.
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