Clue: Top tip for real trivia nuts, including son heading for Eggheads — he's aiming high (9)
Answer: ARRIVISTE
Explanation: Definition: he's aiming high
(R trivia S)* + heading/first letter of **E**ggheads
 "nuts" is the anagrind, with fodder: **R**eal + trivia + **S** (son)