Crossword Genius

A sibling's unchanged (2,2)

Ross

I believe the answer is:

as is

'unchanged' is the definition.
(I've seen this before)

'a sibling's' is the wordplay.
'sibling' becomes 'sis' (I have seen 'Little sibling ' mean 'sis' so perhaps 'sibling' could also mean 'sis').
'a'+'sis'='AS IS'

(Other definitions for as is that I've seen before include "in the present circumstances" , "current state" , "not changed" , "In present condition" , "unaltered" .)

I've seen this clue in The Telegraph.
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