Liar not, unusually, before a judge? (2,5)

I believe the answer is:

on trial

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'before a judge?' is the definition.
I can't judge whether this defines the answer.

'liar not unusually' is the wordplay.
'unusually' is an anagram indicator.
'liar'+'not'='liarnot'
'liarnot' is an anagram of 'ON TRIAL'.

Can you help me to learn more?

(Other definitions for on trial that I've seen before include "Undergoing scrutiny" , "like a footballer seeking club?" , "Undergo court proceedings - being tested" , "Subject to being found satisfactory" , "In court to answer charges" .)

I've seen this clue in The Times.

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