Fact US lawyer presented to corporation (5)
I believe the answer is:
datum
'fact' is the definition.
(thesaurus)
'us lawyer presented to corporation' is the wordplay.
'us lawyer' becomes 'da' (abbreviation for District Attorney).
'presented to' says to put letters next to each other.
'corporation' becomes 'tum' (I've seen this before).
'da'+'tum'='DATUM'
(Other definitions for datum that I've seen before include "Given fact" , "Single informative fact" , "Something given" , "Fixed starting point for measurements" , "Given item" .)