Counterfeit ivories that come out at night! (5,5)
I believe the answer is:
false teeth
'counterfeit ivories that come out at night' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'counterfeit ivories' is the wordplay.
'counterfeit' becomes 'false' (associated in meaning).
'ivories' becomes 'teeth' (I've seen this in another clue).
'false'+'teeth'='FALSE TEETH'
Can you help me to learn more?
(Other definitions for false teeth that I've seen before include "Denture's components" , "New gnashers!" , "Choppers that may be taken out" , "Plates" , "set out at night" .)