Highly-motivated daughter needs rent (6)
I believe the answer is:
driven
'highly-motivated' is the definition.
(I know this)
'daughter needs rent' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'needs' says to put letters next to each other.
'rent' becomes 'riven' (rent can mean torn or riven).
'd'+'riven'='DRIVEN'
(Other definitions for driven that I've seen before include "Urges or conveyed, perhaps in car" , "Determined" , "Highly motivated (informal)" , "Urged or forced along" , "Propelled like a hard bargain" .)