Sign for one returning skirt (6)
I believe the answer is:
gemini
'sign' is the definition.
(Gemini is a star sign)
'for one returning skirt' is the wordplay.
'for one' becomes 'eg' (both can mean 'for example').
'returning' shows that the letters should be reversed in order.
'skirt' becomes 'mini' (a mini skirt).
'eg' back-to-front is 'ge'.
'ge'+'mini'='GEMINI'
(Other definitions for gemini that I've seen before include "Twins star-sign" , "star group" , "Sign of the Twins ( 6)" , "space programme" , "Zodiac sign - the Twins" .)