Clue: Son also wearing tartan trousers in university town (2,7)
Answer: ST ANDREWS
Explanation: Son also wearing tartan trousers in university town (2,7)
S(on) + AND ("also") "wearing" TREWS ("tartan trousers") 
*Trews are traditional Scottish trousers, and St Andrews, as well as being the home of golf, is also home to the oldest University in Scotland and the third-oldest in the English-speaking world.