Sound very good, though having got a little disheartened (7)
I believe the answer is:
crackle
'sound' is the definition.
(crackle is a kind of sound)
'though having got a little disheartened' is the wordplay.
'though' becomes 'crack' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'having got' is a charade indicator (letters next to each other).
'disheartened' says to hollow out the word (remove centre letters).
'little' with its centre removed is 'le'.
'crack'+'le'='CRACKLE'
'very good' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for crackle that I've seen before include "Noise of, eg, electrical discharge" , "Loud rustling" , "sort of porcelain" , "Sound as of dry twigs burning" , "(Make) slight sharp sounds" .)