Very old nurse, shaken outside, apprehensive (7)
I believe the answer is:
nervous
'apprehensive' is the definition.
(synonyms)
'very old nurse shaken outside' is the wordplay.
'very' becomes 'v' (abbreviation).
'old' becomes 'o' (abbreviation).
'shaken' indicates an anagram.
'outside' is an insertion indicator.
'nurse' anagrammed gives 'nerus'.
'v'+'o'='vo'
'vo' put inside 'nerus' is 'NERVOUS'.
(Other definitions for nervous that I've seen before include "Tense" , "Twitchy" , "Worried, apprehensive" , "Anxious, uneasy" , "Jumpy" .)