Doctor Lambert sees three outside, shivering (7)

I believe the answer is:

trembly

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'shivering' is the definition.
(thesaurus)

'doctor lambert sees three outside' is the wordplay.
'doctor' becomes 'MB' (Bachelor of Medicine, Medicinae Baccalaureus).
'lambert' becomes 'L' (synonyms).
'sees three' becomes 'trey' (I can't justify this - if you can you should believe this answer much more).
'outside' indicates putting letters inside (some letters go outside others).
'mb'+'l'='mbl'
'mbl' put into 'trey' is 'TREMBLY'.

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

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