Embellish stay on part of ship (6)
I believe the answer is:
bedeck
'embellish' is the definition.
(bedecking is a kind of embellishing)
'stay on part of ship' is the wordplay.
'stay' becomes 'be' (stay can mean to continue to be a certain way).
'on' is a charade indicator (letters next to each other).
'part of ship' becomes 'deck' ('deck' is part of 'ship').
'be'+'deck'='BEDECK'
(Other definitions for bedeck that I've seen before include "Trim" , "Embellish with adornments" , "Adorn, cover with decorations" , "Festoon, adorn" , "Lavishly decorate" .)