Executives selling interior of boat (6)
I believe the answer is:
vessel
'boat' is the definition.
(boat is a type of vessel)
'executives selling interior of' is the wordplay.
'interior of' indicates a hidden word.
'VESSEL' is hidden within 'executives selling'.
(Other definitions for vessel that I've seen before include "Blood-carrying tube or a ship" , "A ship or kitchen utensil" , "Bark, possibly, needing water" , "Decide on or establish" , "bowl?" .)