Sailors having a party on deck (5)

I believe the answer is:
adorn
'deck' is the definition.
(I've seen this before)
'sailors having a party' is the wordplay.
I cannot really see how this works, but
'sailors' could be 'rn' (Royal Navy) and 'rn' is present in the answer.
'a' is found in the answer.
'party' could be 'do' (do can informally mean a party) and 'do' is located in the answer.
No letters remain.
This explanation may well be incorrect...
'on' acts as a link.
Can you help me to learn more?
(Other definitions for adorn that I've seen before include "Embellish, decorate" , "Deck" , "dress" , "Make more attractive" , "Attire" .)
