Clue: Unruly chap punched by king, attention-seeker leaves (3,4)
Answer: PAK CHOI
Explanation: Definition: leaves
A charade of PAKCH, an envelope ('punched by') of K ('king') in PACH, an anagram ('unruly') of 'chap'; plus OI (a shout, 'attention-seeker'). Round our way, the Chinese cabbage is known as bok choi.