What does the cryptic crossword clue "Reconsider second exercise over youngster getting upset (4,5)" mean?

The wordplay uses a reversal. BACK (synonym="to second") + PE (synonym="exercise") + LAD (reversal="LAD") = BACKPEDAL The answer is BACKPEDAL.

Reconsider second exercise over youngster getting upset (4,5)

Guardian Cryptic #29173 | 6 Down | 2023-09-12 flower