What does the cryptic crossword clue "He’d not to go off course at the exact time (2,3,3)" mean?

The definition is "exact time". The wordplay uses an anagram. anagram of HE’D + NOT + TO = ONTHEDOT; definition: "exact time" The answer is ONTHEDOT.

He’d not to go off course at the exact time (2,3,3)

Guardian Cryptic #29537 | 18 Down | 2024-11-11 flower