Tolerate bare impropriety (4)

I believe the answer is:

bear

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'tolerate' is the definition.
(synonyms)

'bare impropriety' is the wordplay.
'bare' can be anagrammed to 'BEAR'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for bear that I've seen before include "Support; brutish person" , "Carry, convey" , "Exhibit" , "someone being ill-mannered" , "Support (a weight)" .)

I've seen this clue in The Mirror.

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