Grazing the top half of foliage (3)
I believe the answer is:
lea
'grazing the top' is the definition.
'lea' can be an answer for 'grazing' (thesaurus). I'm not certain of the 'the top' bit.
'half of foliage' is the wordplay.
'half of' means to take half the letters.
'foliage' becomes 'leaves' (I've seen this in another clue).
'leaves' cut in half is 'LEA'.
Can you help me to learn more?
(Other definitions for lea that I've seen before include "Poetically, a piece of meadow or pasture" , "authority for teachers" , "''The lowing herd winds slowly o'er the ... '' (Gray)" , "'The lowing herd wind slowly o'er the . . .'" , "Grazing land" .)