Nothing in the sailing vessel is lavishly embellished (7)
I believe the answer is:
baroque
'lavishly embellished' is the definition.
'baroque' can be an answer for 'embellished' (thesaurus). I'm not sure about the 'lavishly' bit.
'nothing in the sailing vessel' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'in the' indicates putting letters inside.
'sailing vessel' becomes 'barque' (barque is a kind of sailing vessel).
'o' put into 'barque' is 'BAROQUE'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for baroque that I've seen before include "Bach's music style" , "Architectural period" , "Elaborately ornamented" , "17th century style" , "Ornate architectural style" .)