Group of astrological signs (6)
I believe the answer is:
zodiac
'group of astrological signs' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for zodiac that I've seen before include "Twelve-sign belt" , "Houses seen on a cycle" , "Astronogical sky band with 12 parts" , "Star sign chart" , "Twelve constellations together" .)