Around time of birth parent mostly laid out (9)
I believe the answer is:
perinatal
'around time of birth' is the definition.
(I've seen this before)
'parent mostly laid out' is the wordplay.
'mostly' means to remove the last letter.
'out' indicates an anagram (out can mean wrong or inaccurate).
'laid' with its final letter taken away is 'lai'.
'parent'+'lai'='parentlai'
'parentlai' with letters rearranged gives 'PERINATAL'.
(Other definitions for perinatal that I've seen before include "around arrival time" , "around time of birth" .)