What does the cryptic crossword clue "Prosthetic leg's easy to replace (5,3)" mean?

The definition is "Prosthetic". The wordplay uses an anagram. anagram of LEG'S + EASY = GLASSEYE; definition: "Prosthetic" The answer is GLASSEYE.

Prosthetic leg's easy to replace (5,3)

Independent Cryptic #10919 | 27 Across | 2021-10-11 flower