Buccaneer puts traitor in baked dish (6)
I believe the answer is:
pirate
'buccaneer' is the definition.
(synonyms)
'traitor in baked dish' is the wordplay.
'traitor' becomes 'rat' (rat can mean a traitor).
'in' means one lot of letters goes inside another.
'baked dish' becomes 'pie' (I've seen this before).
'rat' placed within 'pie' is 'PIRATE'.
'puts' acts as a link.
(Other definitions for pirate that I've seen before include "Plagiarise" , "Freebooter" , "Use (another's work) for profit without permission" , "Publish without permission" , "Hook for one" .)