Back on board, wearing headphones and loose items of clothing (7)
I believe the answer is:
caftans
'loose items of clothing' is the definition.
(I know this)
'back on board wearing headphones' is the wordplay.
'back on board' becomes 'aft' (at the back of a ship).
'wearing' means one lot of letters goes inside another.
'headphones' becomes 'cans' (I've seen this before).
'aft' going inside 'cans' is 'CAFTANS'.
'and' acts as a link.
(Other definitions for caftans that I've seen before include "Long clothes" , "Loose clothes" .)