First zodiac sign (5)
I believe the answer is:
aries
'first zodiac sign' 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 "Ram star sign" , "Philip -, English poet" , "Zodiac ram" , "star group" , "Zodiacal sign also known as the Ram" .)