Crossword Genius

Old Roman poet in Dublin suburb? (5)

Ross

I believe the answer is:

lucan

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'old roman poet' is the definition.
'lucan' can be an answer for 'poet' (I have seen 'Roman poet' mean 'lucan' so perhaps 'poet' could also mean 'lucan'). I am unsure of the 'old roman' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lucan that I've seen before include "Roman poet - vanishing lord" , "Notorious fugitive peer" , "Lord who famously went missing" , "Roman poet; a missing Lord" , "found in one of the gospels?" .)

I've seen this clue in The Irish Times.
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