Surplus to requirements and turned off (9)
I believe the answer is:
redundant
'surplus to requirements' is the definition.
(I've seen this before)
'and turned off' is the wordplay.
'off' indicates an anagram.
'and'+'turned'='andturned'
'andturned' with letters rearranged gives 'REDUNDANT'.
(Other definitions for redundant that I've seen before include "getting P45?" , "unwanted" , "laid off" , "out of a job" , "no longer needed" .)