What does the cryptic crossword clue "Snooze more than refreshed upset Leo (8)" mean?

The definition is "Snooze more than". The wordplay uses an anagram. anagram of UPSET LEO = OUTSLEEP The answer is OUTSLEEP.

Snooze more than refreshed upset Leo (8)

Independent Cryptic #11922 | 10 Across | 2024-12-25 flower