Eleventh sign of the zodiac (8)
I believe the answer is:
aquarius
'eleventh sign of the zodiac' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for aquarius that I've seen before include "The Water-carrier, 11th sign of the Zodiac" , "Sign of the zodiac, the water-bearers" , "Sign of the zodiac, the water-bearer" , "The Water Bearer" , "Zodiacal constellation" .)