Geoff’s hat-trick, underlining rich sporting talent from the outset (5)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

First letters (from the outset) of H [at-trick] U [nderlining] R [ich] S [porting] T [alent]. Extended definition: England footballer Geoff Hurst was the first player ever to score a hat-trick in a World Cup final, in the 1966 win against West Germany.