Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
underwriter [ˈʌndəraɪtər] n (INSURANCE) андерра́йтер, принима́ющий m adj на себя́ страхово́й риск
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.