Over in Big Bash final for Mitch Marsh (6)

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

( O [over] contained in [in] SLUG [a big bash]) + H (last letter of [final] MITC H ) – Mitch Marsh is an Australian cricketer who frequently plays in the Australian Big Bash T-20 cricket tournament.  The 2024 / 2025 tournament begins very soon, on Sunday 15th December)