A Shropshire one is poetic (3)

I believe the answer is:

lad

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'a shropshire one' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I don't understand the remainder of the clue.

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(Other definitions for lad that I've seen before include "A young chap into ballads" , "Stable employee" , "Son" , "(Housman's Shropshire) boy" , "Chap, fellow" .)

I've seen this clue in the Evening Standard.

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