Judas Iscariot, within: unaltered (2,2)

I believe the answer is:

as is

'unaltered' is the definition.
(ie something left 'as is')

'judas iscariot within' is the wordplay.
'within' indicates the answer is hidden within the clue.
'AS IS' can be found hidden inside 'judas iscariot'.

(Other definitions for as is that I've seen before include "In the existing circumstances" , "In existing state" , "current state" , "In the current circumstances" , "unchanged" .)

I've seen this clue in The Everyman puzzle in The Observer.

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