### Clue: Enlighten incompetent university pal about batting (10)
### Answer: ILLUMINATE 
 ### Explanation: Enlighten incompetent university pal about batting (10)
ILL ("incompetent") + U(niversity) MATE ("pal") "about" IN ("batting") 
*Initially, I wasn't sure about "incompetent" for ILL, as it's a bit old-fashioned in that sense, but I've convinced myself it's OK.