Places to learn about harmony (6)
I believe the answer is:
unison
'harmony' is the definition.
(I know that unison is a type of accord)
'places to learn about' is the wordplay.
I cannot really see how this works, but
'places' could be 'unis' (I have seen 'Places of education' mean 'unis' so perhaps 'places' could also mean 'unis') and 'unis' is present in the answer.
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for unison that I've seen before include "Concord; a trade union" , "Unanimity" , "Accord" , "Simultaneous utterance" , "Unscrupulous dealer" .)