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Marked with dots, plans ultimately something to go on! (6)

Ross

I believe the answer is:

spotty

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'marked' is the definition.
(thesaurus)

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(Other definitions for spotty that I've seen before include "Inconsistent" , "Teenagers are often so" , "Pimply or covered with dots" , "Maculate (like a leopard?)" , "Covered in rash" .)

I've seen this clue in The Telegraph.
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