Not highly disreputable? (3)

I believe the answer is:

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'disreputable?' is the definition.
(both can mean immoral or indecent)

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

Can you help me to learn more?

(Other definitions for low that I've seen before include "Depressed; moo" , "Inferior; not loud" , "Inferior, cow's call" , "Not high or loud" , "Not high - that's mean" .)

I've seen this clue in the Evening Standard.

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