Bar in Spain -- go there! (5)
I believe the answer is:
ingot
'bar' is the definition.
(block of metal, eg a bar of gold)
'in spain go there' is the wordplay.
'in' says the answer is hidden in the clue.
'INGOT' is hidden within 'spain go there'.
(Other definitions for ingot that I've seen before include "expensive block" , "Block of, eg, gold" , "A lump of metal like gold" , "Block (of steel, gold, etc)" , "A brick shaped lump of gold" .)