Change of scenery, as needed (9)
I believe the answer is:
necessary
'needed' is the definition.
('necessary' can be similar in meaning to 'needed')
'change of scenery as' is the wordplay.
'change of' indicates anagramming the letters.
'scenery'+'as'='sceneryas'
'sceneryas' anagrammed gives 'NECESSARY'.
(Other definitions for necessary that I've seen before include "Indispensable, essential" , "Indispensable, essentional" , "Indespensable, essential" , "Vital" , "Requisite" .)