Vessel shows ability (5)
I believe the answer is:
craft
I believe this is a double definition.
'vessel' is the first definition.
(synonyms)
'ability' is the second definition.
(I know that craft is a type of accomplishment)
'shows' acts as a link.
(Other definitions for craft that I've seen before include "packet!" , "Occupation in which skill is needed" , "Skill, cunning" , "Vessel for a skilled occupation" , "It requires special skill" .)