Pastoral deity (4)
I believe the answer is:
faun
'pastoral deity' is the definition.
(half-goat, half-man in classical mythology)
This is the entire clue.
(Other definitions for faun that I've seen before include "This old deity" , "Roman deity, in the form of a man with a goat's horns, legs and tail" , "Rural deity, half-man, half-goat" , "Mr Tumnus or his ilk" , "Rural deity with the form of a man-goat" .)