Copper gets point of symbol (3)
I believe the answer is:
cue
'symbol' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'copper gets point' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'gets' says to put letters next to each other.
'point' becomes 'e' (compass point).
'cu'+'e'='CUE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for cue that I've seen before include "Rod used in billiards" , "hit ball, in a way" , "Sporting rod" , "line in speech" , "Signal (to actor)" .)