Crossword Genius

Crass lies about aliens turning back from Mars (9)

Ross

I believe the answer is:

tasteless

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'crass' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

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(Other definitions for tasteless that I've seen before include "Unseemly" , "Lacking flavour or ability to appreciate the beautiful" , "improper" , "Insipid - vulgar" , "Vapid" .)

I've seen this clue in The Daily Express.
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