Animal urinates over top of hedge, facing the other way (5)
I believe the answer is:
sheep
'animal' is the definition.
(I have seen 'Woolly animal ' mean 'sheep' so perhaps 'animal' could also mean 'sheep')
'urinates over top of hedge facing the other way' is the wordplay.
'urinates' becomes 'pees' ('pee' can be a synonym of 'urinate').
'over' is an insertion indicator.
'top of' says to take the initial letters.
'facing the other way' says the letters should be written in reverse.
The initial letter of 'hedge' is 'h'.
'pees' placed around 'h' is 'peehs'.
'peehs' written backwards gives 'SHEEP'.
(Other definitions for sheep that I've seen before include "Source of lamb" , "Ewe" , "Farm animals" , "Woolly ruminants" , "Easily led people" .)