Interpretations and sources in Rosencrantz And Guildenstern Are Dead in filleted Shakespeare works (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Anagram (. . . works) of a lot of separate bits: first letters (sources) of R [osencrantz] + G [uildenstern], A (abbreviation for are = unit of area = 100 square metres), D (abbreviation for dead), IN , and S [hakespear] E (filleted = inner letters removed).