I'm to hanker about obligation, being fretful (9)
I believe the answer is:
impatient
'fretful' is the definition.
(thesaurus)
'i'm to hanker about obligation' is the wordplay.
'to hanker' becomes 'pant' (I can't justify this - if you can you should believe this answer much more).
'about' is an insertion indicator.
'obligation' becomes 'tie' (I've seen this before).
'pant' going around 'tie' is 'patient'.
'im'+'patient'='IMPATIENT'
'being' is the link.
Can you help me to learn more?
(Other definitions for impatient that I've seen before include "appeared anxious" , "Pit at mine (anag.)" , "those who hate waiting" , "Agitated" , "Job wasn't" .)