Decorate for a party with sailors (5)
I believe the answer is:
adorn
'decorate' is the definition.
(synonyms)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for adorn that I've seen before include "Embellish, decorate" , "Attire" , "Deck" , "Festoon" , "Make more attractive" .)