Highly motivated household finally torn apart (6)
I believe the answer is:
driven
'highly motivated' is the definition.
(I've seen this before)
'household finally torn apart' is the wordplay.
'finally' says to take the final letters.
'torn apart' becomes 'riven' (I've seen this before).
The final letter of 'household' is 'd'.
'd'+'riven'='DRIVEN'
(Other definitions for driven that I've seen before include "Determined" , "(Psychologically) impelled" , "Highly motivated (informal)" , "Propelled like a hard bargain" , "Urges or conveyed, perhaps in car" .)