### Clue: Extremely blonde, what I have is a 1960s' hairstyle (7)
### Answer: BEEHIVE 
 ### Explanation: Definition: a 1960s' hairstyle
 **The 1st and last letters of**(Extremely) "blonde" + EH?(expression meaning "What?" or "What did you say?") + I'VE(contraction of "I have").