Musical instrument is brought over by sailor (5)
I believe the answer is:
sitar
'musical instrument' is the definition.
(sitar is a kind of musical instrument)
'is brought over by sailor' is the wordplay.
'brought over' says the letters should be written in reverse.
'by' says to put letters next to each other.
'sailor' becomes 'tar' (slang term for a sailor).
'is' back-to-front is 'si'.
'si'+'tar'='SITAR'
(Other definitions for sitar that I've seen before include "Astir with Indian long-necked lute" , "Stringed instrument of the subcontinent" , "Hindu stringed instrument" , "Long-necked musical instrument of India" , "Indian stringed instrument" .)