Unfortunately I retain a tendency not to change (7)
I believe the answer is:
inertia
'a tendency not to change' is the definition.
I can't judge whether this definition defines the answer.
'unfortunately i retain' is the wordplay.
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'i'+'retain'='iretain'
'iretain' anagrammed gives 'INERTIA'.
Can you help me to learn more?
(Other definitions for inertia that I've seen before include "Slowness to act, lack of strength" , "I tear in (anag.)" , "Tendency to remain at rest or in steady motion" , "Idleness" , "Slowness to move or act" .)