A judicial procedure in court (6)
I believe the answer is:
atrial
'in court' is the definition.
(I've seen this before)
'a judicial procedure' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
The remaining letters 'trial' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for atrial that I've seen before include "referring to Chambers?" , "Like some courts" , "of the heart cavities" , "Like main court" , "Lariat (anag)" .)