Three-lobed leaf (7)
I believe the answer is:
trefoil
'three-lobed leaf' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for trefoil that I've seen before include "Small plant with yellow flowers and three leaves - to rifle (anag)" , "bacon-and-eggs?" , "Plant with clover-like leaves" , "clover, possibly" , "Leaf divided into three sections" .)