Piece of foliage covering up twig and berries? (3,4)
I believe the answer is:
fig leaf
This clue could be a double definition.
'piece of foliage' is the first definition.
'fig leaf' can be an answer for 'foliage' (fig leaf is a kind of foliage). I'm not sure about the 'piece of' bit.
'covering up twig and berries?' is the second definition.
I know that 'covering' relates to this answer.
(Other definitions for fig leaf that I've seen before include "Eve's modesty garment?" , "Adam and Eve attire" , "Piece of greenery once used to hide nudity, as on statue" , "Greenery worn by Adam or Eve" , "Green growth from 17 Across to cover nudity" .)