It may seem reasonable in court (5)

I believe the answer is:

doubt

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'it may seem reasonable in court' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for doubt that I've seen before include "Lack of conviction" , "Uncertainty, mistrust" , "Feeling of uncertainty about something" , "Have reservations or be uncertain about" , "Don't be so sure!" .)

I've seen this clue in the Evening Standard.

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