Bright-coloured ring attached to compass (6)
I believe the answer is:
orange
'bright-coloured' is the definition.
(orange is a bright colour)
'ring attached to compass' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'attached to' is a charade indicator (letters next to each other).
'compass' becomes 'range' (synonyms).
'o'+'range'='ORANGE'
(Other definitions for orange that I've seen before include "Round fruit (6)" , "Colour between red and yellow" , "Dutch royal house" , "Citrus fruit; colour" , "Stocking-filler fruit" .)