Clue: Former president's party joined by confused university Blue (6-1)
Answer: DOUBLE-U
Explanation: Definition: Former president
**DO** ("party") *joined by* ***(u blue) **[anag:*confused*] 
 
 
*I assume this refers to George W Bush, but I think it's a stretch as he was known as W. I appreciate that W and Double U are synonymous, but Bush was definitely W.