Confidence in dieter cut after wobble (9)
I believe the answer is:
certitude
'confidence' is the definition.
(thesaurus)
'dieter cut after wobble' is the wordplay.
'after' means one lot of letters go next to another.
'wobble' is an anagram indicator (I've seen 'wobbling' mean this).
'dieter'+'cut'='dietercut'
'dietercut' anagrammed gives 'CERTITUDE'.
'in' is the link.
(Other definitions for certitude that I've seen before include "Something about which one is sure" , "One's sure" , "Feeling of surety" , "A feeling of conviction, given rectitude" .)