Crossword Genius

Absurd indentations at the front of both ears (7)

Ross

I believe the answer is:

idiotic

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'absurd' is the definition.
(I know that absurd can be written as idiotic)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for idiotic that I've seen before include "Inviting ridicule" , "Half witted" , "Stupid, foolish" , "Daft" , "Fatuous" .)

I've seen this clue in The Sunday Times and The Times.
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