What does the cryptic crossword clue "When reversing, some forgot Tesla frequently makes high pitch (8)" mean?

The definition is "pitch". The wordplay uses a hidden word. A hidden reversal in forg OT TESLA F requently The answer is FALSETTO.

When reversing, some forgot Tesla frequently makes high pitch (8)

Guardian Cryptic #29511 | 21 Across | 2024-10-11 flower