Crossword Genius

Essential as scenery changes (9)

Ross

I believe the answer is:

necessary

'essential' is the definition.
(similar in meaning)

'as scenery changes' is the wordplay.
'changes' indicates anagramming the letters.
'as'+'scenery'='asscenery'
'asscenery' is an anagram of 'NECESSARY'.

(Other definitions for necessary that I've seen before include "Required to be done" , "Essential, needed" , "Indespensable, essential" , "Inescapable" , "the money?" .)

I've seen this clue in The Irish Independent.
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