Possibly I retain indolence (7)
I believe the answer is:
inertia
'indolence' is the definition.
(thesaurus)
'possibly i retain' is the wordplay.
'possibly' is an anagram indicator.
'i'+'retain'='iretain'
'iretain' with letters rearranged gives 'INERTIA'.
(Other definitions for inertia that I've seen before include "Stagnating state" , "Slowness to react" , "Disinclination to change" , "Slowness to take action, state of laziness" , "Change-resisting tendency" .)