The second sign of the zodiac (6)
I believe the answer is:
taurus
'the second sign of the zodiac' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for taurus that I've seen before include "Bull constellation" , "Sign of the Bull from 12 across" , "Bull star sign" , "A group of stars" , "Zodiac sign - constellation" .)