Become entangled in some shrubbery (4)
I believe the answer is:
mesh
'become entangled' is the definition.
(to mesh is to become entangled or connected)
'in some shrubbery' is the wordplay.
'in' says the answer is hidden in the clue.
'MESH' is hidden in the letters of 'some shrubbery'.
(Other definitions for mesh that I've seen before include "Netting; engage" , "Open fabric" , "Work well together" , "Interlaced structure" , "Entangle, entwine" .)