Willing to leave but not the first of one’s total possessions (6)
I believe the answer is:
estate
'total possessions' is the definition.
(I've seen this before)
'willing to leave but not the first of one's' is the wordplay.
'willing to' becomes 'est' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'leave' says the letters should be written in reverse (I've seen 'left' mean this).
'but' becomes 'yet' (synonyms).
'not the first of' means to remove the first letter (I've seen 'not the first' mean this).
'one' becomes 'a'.
'yet' with its initial letter removed is 'et'.
'et'+'a'='eta'
'eta' back-to-front is 'ate'.
'est'+'ate'='ESTATE'
Can you help me to learn more?
(Other definitions for estate that I've seen before include "Country property" , "(see 1)" , "Lands" , "Sort of car" , "Italian summer" .)