I'm retiring into an easily-managed residence (8)
I believe the answer is:
domicile
'residence' is the definition.
(I know that domicile is a type of residence)
'i'm retiring into an easily-managed' is the wordplay.
'retiring' shows that the letters should be reversed in order.
'into' is an insertion indicator.
'an easily managed' becomes 'docile' (I've seen this before).
'im' reversed gives 'mi'.
'mi' going into 'docile' is 'DOMICILE'.
(Other definitions for domicile that I've seen before include "Dwelling" , "Legal place of residence" , "Permanent legal residence" , "Place of residence, abode" , "house" .)