Famous liberator, perhaps, has one in Dublin and Limerick (6)

I believe the answer is:

street

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'limerick' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for street that I've seen before include "Urban thoroughfare" , "Tester (anag.)" , "Part of motorist's route" , "See 17" , "See 14" .)

I've seen this clue in The Irish Times.

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