Clue: Broadly humorous Blair, afflicted with amnesia, miles away (11)
Answer: RABELAISIAN
Explanation: Broadly humorous Blair, afflicted with amnesia, miles away (11)
***(blair anesia) **where anesia is A(M)NESIA *with* M (miles) *away*. 
Francois Rabelais (d 1553), was a humorous French writer whose most famous creations were Gargantua and Pantagruel.