Unfortunately I retain an inclination to indolence (7)
I believe the answer is:
inertia
'indolence' is the definition.
(thesaurus)
'unfortunately i retain' is the wordplay.
'unfortunately' indicates anagramming the letters (a bad or unfortunate spelling).
'i'+'retain'='iretain'
'iretain' is an anagram of 'INERTIA'.
'an inclination to' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for inertia that I've seen before include "Lack of inclination to move" , "Reluctance to change" , "Slowness to react" , "Torpor" , "Tendency to remain at rest or in steady motion" .)