What does the cryptic crossword clue "Digit, two or eight, originally (3)" mean?

The definition is "Digit,". The wordplay uses acrostic. first letters of "two or eight," = TOE; definition: "Digit," The answer is Toe.

Digit, two or eight, originally (3)

Telegraph Prize Cryptic #3143 | 27 Across | 2022-01-16 flower