Plant broken range in the middle of room (7)
I believe the answer is:
oregano
'plant' is the definition.
(oregano is a kind of plant)
'broken range in the middle of room' is the wordplay.
'broken' indicates an anagram.
'in the' indicates putting letters inside.
'middle of' says to take the centre.
The centre of 'room' is 'oo'.
'range' with letters rearranged gives 'regan'.
'regan' placed into 'oo' is 'OREGANO'.
(Other definitions for oregano that I've seen before include "Gear Ono up for the herb" , "Wild marjoram" , "Sweet-smelling herb" , "Herb related to marjoram" , "Marjoram-like herb" .)