Leave property on Monopoly board (6)
I believe the answer is:
strand
'leave' is the definition.
(I know that strand is a more specific form of the action abandon)
'property on monopoly board' is the wordplay.
'property' becomes 'sand' (sand is a kind of property).
'on' is an insertion indicator (as in clothing 'on' a person).
'monopoly board' becomes 'tr' (I can't justify this - if you can you should give a lot more credence to this answer).
'sand' enclosing 'tr' is 'STRAND'.
Can you help me to learn more?
(Other definitions for strand that I've seen before include "Margin by a beach" , "Leave helpless - length of fibre" , "Leave aground -- length of thread" , "Leave aground on shore" , "Yarn - thread" .)