Opinion of article on golden year (6)
I believe the answer is:
theory
'opinion' is the definition.
(thesaurus)
'article on golden year' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'on' means one lot of letters go next to another.
'golden' becomes 'or'.
'year' becomes 'y'.
'the'+'or'+'y'='THEORY'
'of' acts as a link.
(Other definitions for theory that I've seen before include "Hypothetical reasoning" , "Opinion or supposition to explain something" , "Speculative view" , "Explanation or system of anything" , "Suggested explanation" .)