Crossword Genius

Cambridge undergraduate has last one in sari shaken (5)

Ross

I believe the answer is:

sizar

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'cambridge undergraduate' is the definition.
The definition suggests a singular noun which matches the answer.

'last one in sari shaken' is the wordplay.
'last' becomes 'z' (I can't justify this - if you can you should believe this answer much more).
'one in' indicates putting letters inside.
'shaken' indicates an anagram.
'sari' is an anagram of 'siar'.
'z' placed into 'siar' is 'SIZAR'.

'has' is the link.

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I've seen this clue in the Sydney Morning Herald.
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