stuff CLOB in trigger

How can I get around this? I want to update :new.myclob in trigger. Oracle says no can do on this type.

select cust.myotherclob

      into :new.myclob
    from cust
    where cust.cust_id = ( select cust_id

                           from order
                           where order.cust_id = :new.cust_id );

Thanks

--
Jim Poe (jpoe_at_fulcrumit.com)