Table put to very good use (5)
I believe the answer is:
'table' is the definition.
(I know that altar is a type of table)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for altar that I've seen before include "Sacred table" , "where sacrifices are made" , "Place of sacrifice" , "Sacrificial block" , "Sacrificial table" .)