Court trial’s latest material (4)
I believe the answer is:
wool
'material' is the definition.
(wool is a kind of material)
'court trial's latest' is the wordplay.
'court' becomes 'woo' (both can mean to romance someone).
'latest' indicates one should take the final letters.
The final letter of 'trial' is 'l'.
'woo'+'l'='WOOL'
(Other definitions for wool that I've seen before include "Hair of sheep etc" , "Pull this over the eyes to deceive" , "Yarn - cloth" , "Sheep's coat" , "Fabric made from the hair of sheep" .)