Like gluey material in trial (6)

I believe the answer is:

assize

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'trial' is the definition.
(thesaurus)

'like gluey material' is the wordplay.
'like' becomes 'as'.
'gluey material' becomes 'size' (size is a kind of material. I am not sure about the 'gluey' bit.**).
'as'+'size'='ASSIZE'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for assize that I've seen before include "Old-style judicial sitting" , "sitting in judgment" , "Set price or quantity of; law court" , "Periodic court" , "Old English court" .)

I've seen this clue in The Telegraph.

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