Like to get firm property (5)
I believe the answer is:
asset
'property' is the definition.
(asset can mean an item of property)
'like to get firm' is the wordplay.
'like' becomes 'as'.
'to get firm' becomes 'set' (I've seen this in another clue).
'as'+'set'='ASSET'
(Other definitions for asset that I've seen before include "Something well worth having" , "One bringing benefit" , "Item of value or advantage" , "Item of property" , "Valuable person" .)