Instrument from the east is given to sailor (5)
I believe the answer is:
sitar
'instrument' is the definition.
(sitar is a kind of instrument)
'from the east is given to sailor' is the wordplay.
'from the east' shows that the letters should be reversed in order.
'given to' says to put letters next to each other.
'sailor' becomes 'tar' (slang term for a sailor).
'is' in reverse letter order is 'si'.
'si'+'tar'='SITAR'
(Other definitions for sitar that I've seen before include "Indian stringed instrument" , "Hindu stringed instrument" , "Astir with Indian long-necked lute" , "Long necked and often plucked" , "Lasting from morning to night" .)