Italian trade union has to read document (6)
I believe the answer is:
tuscan
'italian' is the definition.
(someone from Tuscany in Italy)
'trade union has to read document' is the wordplay.
I cannot quite see how this works, but
'union' could be 'tu' (short for trade union) and 'tu' is located in the answer.
'read' could be 'scan' (scanning is a kind of reading) and 'scan' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tuscan that I've seen before include "European" , "Person from Siena" , "From a central Italian region" , "Italian inhabitant of what was once Etruria" , "Italian dialect spoken in Florence" .)