State in Brazil covered in Virginia creeper (4)
I believe the answer is:
acre
'state in brazil' is the definition.
(Acre is a Brazilian state)
'covered in virginia creeper' is the wordplay.
'covered in' says the answer is hidden in the clue.
'ACRE' can be found hidden inside 'virginia creeper'.
(Other definitions for acre that I've seen before include "marine location in Israel" , "Persistent tendency" , "A state of W Brazil" , "Levant sea port" , "Imperial land measure" .)