Penitence, compunction (6)
I believe the answer is:
regret
This clue is a double definition.
'penitence' is the first definition.
(thesaurus)
'compunction' is the second definition.
(I've seen this before)
(Other definitions for regret that I've seen before include "Feel sorry about" , "Feel remorse for" , "Bad feeling" , "Lament" , "Feel sad or disappointed about" .)