Copper added note for receptacles (4)
I believe the answer is:
cups
'receptacles' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'copper added note' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'added note' becomes 'ps' (a PS or postscript in a letter. I am not sure about the 'added' bit.).
'cu'+'ps'='CUPS'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for cups that I've seen before include "Drinking vessels" , "Trophies" , "Small open drinks containers" , "In these, you're tiddly" , "silverware" .)