Lord, a Roman poet! (5)
I believe the answer is:
lucan
'roman poet' is the definition.
(I've seen this before)
'lord a' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for lucan that I've seen before include "Lord who famously went missing" , "Roman poet - vanishing lord" , "Roman poet; a missing Lord" , "Notorious fugitive peer" , "found in one of the gospels?" .)