Cracked a nicer nut? Open to question (9)
I believe the answer is:
uncertain
'cracked a nicer nut? open to question' is the definition.
I can't tell whether this definition defines the answer.
'cracked a nicer nut?' is the wordplay.
'cracked' is an anagram indicator.
'a'+'nicer'+'nut'='anicernut'
'anicernut' anagrammed gives 'UNCERTAIN'.
Can you help me to learn more?
(Other definitions for uncertain that I've seen before include "Not convinced" , "In doubt" , "Not completely confident or sure of" , "dubious" , "Not at all sure or decided" .)