Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
penchant [ˈpɑ̃ːʃɑ̃ːŋ] n скло́нность f
to have a penchant for име́ть (impf) скло́нность к +dat
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.