Highly motivated to get the last of ground rent (6)
I believe the answer is:
driven
'highly motivated' is the definition.
(I've seen this before)
'get the last of ground rent' is the wordplay.
'get' becomes 'drive' (driving is a kind of getting).
'the last of ground rent' becomes 'n' (I can't justify this - if you can you should give a lot more credence to this answer).
'drive'+'n'='DRIVEN'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for driven that I've seen before include "Urged or forced along" , "Given a lift" , "Forced, compelled" , "Highly motivated (informal)" , "Strongly motivated to succeed" .)