Lana is confused about time of birth (5)
I believe the answer is:
natal
'of birth' is the definition.
(natal means relating to birth)
'lana is confused about time' is the wordplay.
'is confused' indicates an anagram.
'about' means one lot of letters goes inside another.
'time' becomes 't' (abbreviation).
'lana' with letters rearranged gives 'naal'.
'naal' going around 't' is 'NATAL'.
(Other definitions for natal that I've seen before include "Relating to the time of one's birth" , "Like a birthday" , "Pertaining to birth" , "Province of South Africa" , "Former African place" .)