Conan Doyle character's superlative conclusion leaving Lestrade confused (5)

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

Anagram (confused) of L [est] RADE , leaving out -EST (suffix indicating “most” = superlative conclusion). Irene Adler, who appears in only one of Conan Doyle’s Sherlock Holmes stories but is mentioned in a few others. For the surface, Lestrade is also a Conan Doyle character: a detective who is somewhat less clever than Holmes and therefore likely to be left confused by his conclusions.