### Clue: Mark retirement of former student beside unrefined resort (11)
### Answer: SCARBOROUGH 
 ### Explanation: Definition: resort
 SCAR(a mark from, say, an old wound) + **reversal of**(retirement of) O.B.(abbrev. for "old boy";a former student) **plus**(beside) ROUGH(unrefined).
Defn: … on the coast of North Yorkshire, England.