Ultimately erratic in nature, subject to change (9)
I believe the answer is:
uncertain
'ultimately erratic in nature subject to change' is the definition.
I can't tell whether this defines the answer.
'ultimately erratic in nature subject to change' is the wordplay.
'ultimately' says to take the final letters.
'subject to change' is an anagram indicator.
The last letter of 'erratic' is 'c'.
'c'+'in'+'nature'='cinnature'
'cinnature' anagrammed gives 'UNCERTAIN'.
Can you help me to learn more?
(Other definitions for uncertain that I've seen before include "Not definite" , "Not completely confident or sure of" , "Lacking confidence" , "Not convinced" , "Not at all sure or decided" .)