Last panto abandoned after little one pulled out (9)
I believe the answer is:
postnatal
'after little one pulled out' is the definition.
(after the birth of a child)
'last panto abandoned' is the wordplay.
'abandoned' indicates an anagram (the original order is abandoned).
'last'+'panto'='lastpanto'
'lastpanto' is an anagram of 'POSTNATAL'.
(Other definitions for postnatal that I've seen before include "a time of new life" , "after delivery" , "Immediately after birth" , "In period after birth" .)