Sign before Taurus (5)
I believe the answer is:
aries
'sign before taurus' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aries that I've seen before include "Sheep" , "Stars" , "Zodiacal sign also known as the Ram" , "Constellation with sign of the ram" , "Ram star sign" .)