Throw gold at star (6)
I believe the answer is:
castor
'star' is the definition.
(I know that Castor is a multiple star)
'throw gold' is the wordplay.
'throw' becomes 'cast' (synonyms).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'cast'+'or'='CASTOR'
'at' acts as a link.
(Other definitions for castor that I've seen before include "hat" , "One star" , "Powdered sugar" , "Small swivelled wheel fixed to each leg of a piece of furniture" , "Furniture wheel; sort of oil" .)