Incus discovered in Roman villa (5)
I believe the answer is:
anvil
'incus' is the definition.
(I have seen 'The incus ' mean 'anvil' so perhaps 'incus' could also mean 'anvil')
'discovered in roman villa' is the wordplay.
'discovered' indicates a hidden word (remove the letters covering the answer in the clue).
'ANVIL' can be found hidden inside 'in roman villa'.
(Other definitions for anvil that I've seen before include "part of the ear" , "Smith's heavy iron block" , "Smithy's block" , "Smithy's last" , "Forging equipment" .)