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The sun is responsible for this scourge for farmers starting off (5)

Ross

I believe the answer is:

light

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'the sun' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for light that I've seen before include "Mild" , "Illuminate or ignite" , "Pale" , "free gift from The Sun" , "Delicate; illuminate" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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