Poor American showing effect of working in the sun? (7)

I believe the answer is:

redneck

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'poor american' is the definition.
(I know that redneck are usually poor)

I can't explain the remainder of the clue.

(Other definitions for redneck that I've seen before include "Poor white called this" , "Intolerant American" , "Poor white American" , "S. US working-class white conservative (derog.)" , "Ignorant bigot" .)

I've seen this clue in The Telegraph.

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