Crossword Genius

A purist's changed mentally (8)

Ross

I believe the answer is:

upstairs

'mentally' is the definition.
(as in not having much going on upstairs)

'a purist's changed' is the wordplay.
'changed' is an anagram indicator.
'a'+'purists'='apurists'
'apurists' anagrammed gives 'UPSTAIRS'.

(Other definitions for upstairs that I've seen before include "at the next level" , "Mentally (colloquial)" , "Above ground floor" , "On an upper storey" , "Having taken steps to rise" .)

I've seen this clue in The Telegraph.
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