Crossword Genius

Weakness makes me tired (7)

Ross

I believe the answer is:

demerit

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

'weakness' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's an association between them I don't understand?

'makes me tired' is the wordplay.
'makes' indicates anagramming the letters.
'me'+'tired'='metired'
'metired' is an anagram of 'DEMERIT'.

Can you help me to learn more?

(Other definitions for demerit that I've seen before include "Mark given for a fault" , "Something deserving censure" , "Conduct that deserves censure" , "Fault, defect" , "Black mark" .)

I've seen this clue in the Evening Standard.
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