Lazy at home, act fast? (8)
I believe the answer is:
indolent
'lazy' is the definition.
(I know this)
'home act fast?' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'act' becomes 'do' (to do is to act or execute a task).
'fast?' becomes 'lent' (Lent is a period of fasting in Christianity).
'in'+'do'+'lent'='INDOLENT'
'at' is the link.
(Other definitions for indolent that I've seen before include "Making no effort" , "Disinclined to exertion or work" , "Lethargic" , "Lazy, slothful" , "not willing to work" .)