Apologetic parent, wrong to gobble peanuts regularly (9)
I believe the answer is:
repentant
'apologetic' is the definition.
(thesaurus)
'parent wrong to gobble peanuts regularly' is the wordplay.
'wrong' is an anagram indicator.
'to gobble' is an insertion indicator.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'peanuts' are 'ent'.
'parent' with letters rearranged gives 'repant'.
'repant' going around 'ent' is 'REPENTANT'.
(Other definitions for repentant that I've seen before include "Regretful" , "Feeling remorse for misdeeds" , "showing contrition" , "Contrite" , "sorry state" .)