In parturition, a tale of birth (5)
I believe the answer is:
natal
'of birth' is the definition.
(I've seen this before)
'in parturition a tale' is the wordplay.
'in' says the answer is hidden in the clue.
'NATAL' can be found hidden inside 'parturition a tale'.
(Other definitions for natal that I've seen before include "dealing with delivery" , "Concerned with the birth" , "African area" , "South African region" , "of an ass?" .)