Around time of arrival of train, leap out (9)
I believe the answer is:
perinatal
'around time of arrival' is the definition.
'train leap out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'train'+'leap'='trainleap'
'trainleap' is an anagram of 'PERINATAL'.
'of' is the link.
(Other definitions for perinatal that I've seen before include "around time of birth" , "around arrival time" .)