Gentleman's unusual queries (7)
I believe the answer is:
esquire
'gentleman's' is the definition.
(thesaurus)
'unusual queries' is the wordplay.
'unusual' is an anagram indicator.
'queries' is an anagram of 'ESQUIRE'.
(Other definitions for esquire that I've seen before include "Originally shield-bearer" , "Title of courtesy for a man" , "Address of a gentleman" , "Title of respect, placed after a man's name" , "Courtesy title for a gentleman" .)