A musical one will get the notes right (3)
I believe the answer is:
ear
'a musical one will' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe there's an association between them I don't understand?
'get the notes right' is the wordplay.
'get' means one lot of letters go next to another.
'the notes' becomes 'ea' ().
'right' becomes 'r' (common abbreviation).
'ea' put next to 'r' is 'EAR'.
Can you help me to learn more?
(Other definitions for ear that I've seen before include "Ability to recognise sounds" , "Sense organ" , "Lug (colloq.)" , "Bit of corn" , "Part of a cereal plant containing the seeds" .)