Young attendant thrown a coin by bishop ... (5,3)
I believe the answer is:
cabin boy
'young attendant' is the definition.
(I've seen this before)
'thrown a coin by bishop' is the wordplay.
'thrown' indicates an anagram.
'bishop' becomes 'B' (abbreviation used in chess).
'a'+'coin'+'by'+'b'='acoinbyb'
'acoinbyb' anagrammed gives 'CABIN BOY'.
(Other definitions for cabin boy that I've seen before include "Young male attendant on board" , "Ship's attendant" , "Servant aboard ship" , "youth on board" , "young sailor" .)