Oracle Database Discussions

I am trying to transfer data into an Oracle Database from Access. The table I'm aiming at is a CLOB, and Access/Windows ODBC are complaining about the sql data type being out of range. Experimenting with removing fields from my script I have narrowed it down to the CLOB filed. I have tried google searches and found several answers to the error but none that has anything to do with CLOBs
The table is set up as a linked table and the file dsn looks like this
I'm using DRIVER=Microsoft ODBC for Oracle in my data source and the Access field I was migrating out of is set as "Memo", but again I've tried experimental loads with more restrictive datatypes and different drivers and not had any joy.
I all else fails I can dump the whole lot to an excel file and load it through sql developer but for various reasons I would rather go through the access route if at all possible. Can anyone help please?
Thanks