Former slave the Spanish must have smuggled outside (5)
I believe the answer is:
helot
'former slave' is the definition.
(helots were slaves in Sparta)
I cannot understand how the rest of the clue works.
(Other definitions for helot that I've seen before include "Hotel (anag) - serf" , "Spartan serf" , "Spartan slave" , "One made to work" , "Greek serf" .)