Block discovered in Roman villa (5)
I believe the answer is:
anvil
'block' is the definition.
(I know that anvil is a type of block)
'discovered in roman villa' is the wordplay.
'discovered' says the answer is hidden in the clue (remove the letters covering the answer in the clue).
'ANVIL' is hidden within 'in roman villa'.
(Other definitions for anvil that I've seen before include "Iron block; incus" , "Heavy block on which to hammer metal" , "Block for metalworking" , "Smithy's block" , "bit off one's ear" .)