Woody plant right inside untidy bush (5)
I believe the answer is:
shrub
'woody plant' is the definition.
(shrub is a kind of woody plant)
'right inside untidy bush' is the wordplay.
'right' becomes 'r' (common abbreviation).
'inside' is an insertion indicator.
'untidy' indicates an anagram.
'bush' with letters rearranged gives 'shub'.
'r' put into 'shub' is 'SHRUB'.
(Other definitions for shrub that I've seen before include "Woody plant, bush" , "Brush? (anagr.)" , "Rose, perhaps" , "Cordial" , "Myrtle or Rosemary, say" .)