This, and mortar, make a working combination (6)
I believe the answer is:
pestle
This clue might be a double definition.
'this and mortar' is the first definition.
The definition suggests a singular noun which matches the answer. I also know that 'mortar' relates to this answer.
'a working combination' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'make' acts as a link.
Can you help me to learn more?
(Other definitions for pestle that I've seen before include "Tool for grinding in a mortar" , "found at pound shop?" , "A grinder or pounder" , "Small club for use with mortar" , "Small club for pounding substances in mortar" .)