What does the cryptic crossword clue "Succeed very easily in a light hour's work (4,7)" mean?

The wordplay uses an anagram. anagram of A + LIGHT + HOUR'S = SAILTHROUGH The answer is SAILTHROUGH.

Succeed very easily in a light hour's work (4,7)

Daily Mail Cryptic #17166 | 19 Across | 2023-08-18 flower