Sloth at home has it back in time (7)
I believe the answer is:
inertia
'sloth' is the definition.
(I've seen this before)
'at home has it back in time' is the wordplay.
'at home' becomes 'in' (similar in meaning).
'has' is a charade indicator (letters next to each other).
'back' is a reversal indicator.
'in' means one lot of letters goes inside another.
'time' becomes 'era' (era is a kind of time).
'it' reversed gives 'ti'.
'ti' placed into 'era' is 'ertia'.
'in'+'ertia'='INERTIA'
(Other definitions for inertia that I've seen before include "showing reluctance to move" , "Motion (if any) when no external force is applied" , "Reluctance to change" , "Tendency to remain at rest or in steady motion" , "Disposition to do nothing" .)