### Clue: Elizabeth knights old boy, long having earned top honour (7)
### Answer: ENNOBLE 
 ### Explanation: Definition: honour
 E(abbrev. for "Elizabeth", as in "QE" or "ER") + N,N(twice the abbrev. for "knight" in chess notation) + OB(abbrev. for "old boy", a former pupil of a school or university, as in "the old boy network in politics") + L(abbrev. for "long", in US usage) **plus**(having) **1st letter of**(… top, in a down clue) "earned".
Defn: To …