Bit of foliage (4)
I believe the answer is:
leaf
'bit of foliage' is the definition.
(foliage means leaves)
This is the entire clue.
(Other definitions for leaf that I've seen before include "Thin sheet of metal" , "Organ of photosynthesis in plants" , "Bit of foliage" , "Turn over a new one to reform" , "Page or piece of foliage" .)