Clover (7)
I believe the answer is:
trefoil
'clover' is the definition.
(I know that clover can be written as trefoil)
This is all the clue.
(Other definitions for trefoil that I've seen before include "Small yellow-flowered plant" , "Clover leaf" , "A flower; three-lobe ornament" , "Small plant with three-lobed leaves" , "Loftier (anag) -- clover-like plant" .)