Possessing a lot of money, moved into expensive block (5)
I believe the answer is:
ingot
'expensive block' is the definition.
(I've seen this before)
'possessing a lot of money moved into' is the wordplay.
'possessing' indicates putting letters inside.
'a lot of money' becomes 'g'.
'moved' indicates an anagram.
'into' is an anagram of 'inot'.
'g' going into 'inot' is 'INGOT'.
(Other definitions for ingot that I've seen before include "A lump of metal, perhaps gold" , "Unwrought metal cast in a mould" , "Metallic bar" , "valuable block" , "Piece of cast metal" .)