Is to have under 500 to take away (10)
I believe the answer is:
dispossess
'take away' is the definition.
(dispossessing is a kind of taking away)
'is to have under 500' is the wordplay.
'to have' becomes 'possess' ('possess' can be a synonym of 'have').
'under' is a charade indicator (letters next to each other) (below, in a down clue).
'e00' becomes 'D' (Roman numeral for e00).
'is'+'possess'='ispossess'
'ispossess' put after 'd' is 'DISPOSSESS'.
'to' is the link.
(Other definitions for dispossess that I've seen before include "Deprive of land and property" , "Deprive (someone) of land/property" , "Expel" , "Drive out l" .)