Can you see something obvious here ?
"I Have table, which has CLOB data type"
versus
"CREATE TABLE C_TEST(ID INETGER, T_FILE BLOB);"
Totally different things "CLOB" and "BLOB"....This is why we ask people give us test cases in AskTOM so we don't waste our time and yours.
A blob contains *binary* data - the only reason we show it to you as hex is so that the client software can give you a meaningful presentation of it.
That blob content could be anything - a word document, a picture, a video - if you want to download it, you can see here:
https://asktom.oracle.com/pls/asktom/asktom.search?tag=retrieving-data-from-blob-into-a-file