Crossword Genius

Thick-headed, thoughtless rubbish (5)

Ross

I believe the answer is:

trash

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'rubbish' is the definition.
(I know that rubbish is a class)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for trash that I've seen before include "Worthless items" , "Rubbish, refuse" , "Vandalise" , "Rubbish, litter" , "bunk" .)

I've seen this clue in the Evening Standard.
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