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Could not find a direct answer but instead converted long in the Informatica mapping to VARCHAR2 (4000)
I faced similar problems with unsupported datatype. At the logical layer I used CAST to VARCHAR (similar format you used in Informatica).
For CLOB I used EVALUATE('DBMS_LOB.SUBSTR(%1,4000,1)',"rpd table"."rpd colum") to do similar but found that CAST works also. the DBMS_LOB functions would be more efficient but we were displaying only a small number of records so was no important. Hope they may be use to you in furture.