Routine disturbed awaiting delivery (2,5)
I believe the answer is:
in utero
'awaiting delivery' is the definition.
(as in delivering a baby)
'routine disturbed' is the wordplay.
'disturbed' indicates anagramming the letters (the order of letters is disturbed).
'routine' with letters rearranged gives 'IN UTERO'.
(Other definitions for in utero that I've seen before include "Within the womb - routine (anag)" , "Embryonic" , "Where the foetus is" , "Before birth - routine (anag)" , "awaiting delivery" .)