Roman satyr-like deity (4)
I believe the answer is:
faun
(Other definitions for faun that I've seen before include "Deity in human shape, with horns and a goat's tail" , "This old deity" , "Roman deity, in the form of a man with a goat's horns, legs and tail" , "Ancient Italian deity with goat-like features" , "Roman goat-like deity" .)