What does the cryptic crossword clue "One ridden may be brought to shore (5)" mean?

The definition is "One ridden". The wordplay uses an anagram. anagram of SHORE = HORSE; definition: "One ridden" The answer is HORSE.

One ridden may be brought to shore (5)

Guardian Cryptic #29339 | 12 Across | 2024-03-25 flower