Some fellahin go to bar (5)
I believe the answer is:
ingot
'bar' is the definition.
(block of metal, eg a bar of gold)
'some fellahin go to' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'INGOT' can be found hidden inside 'fellahin go to'.
(Other definitions for ingot that I've seen before include "Mass of unwrought gold, for instance" , "Block (of steel, gold, etc)" , "Precious metal bar" , "expensive block" , "Metal casting" .)