In centre, gorgeous small sign (6)
I believe the answer is:
gemini
'sign' is the definition.
(Gemini is a star sign)
'in centre gorgeous small' is the wordplay.
'in centre' means to look at the middle letters.
'small' becomes 'mini' (short for miniature).
The central letters of 'gorgeous' are 'ge'.
'ge'+'mini'='GEMINI'
(Other definitions for gemini that I've seen before include "Twins star sign" , "Zodiac sign - the Twins" , "space programme" , "May person" , "Heavenly sign of the Twins" .)