What does the cryptic crossword clue "Part of leg seen kicking backwards but only part (4)" mean?

The definition is "part". The wordplay uses a hidden word. Hidden reversed in "part of leg sEEN Kicking backwards but only part" The answer is KNEE.

Part of leg seen kicking backwards but only part (4)

Independent Cryptic #11864 | 28 Across | 2024-10-18 flower