Crossword Genius

Copper gets point of symbol (3)

Ross

I believe the answer is:

cue

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'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)" .)

I've seen this clue in The Mirror.
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