Key attributes of camels and asses (6)

'asses' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'key attributes of camels' is the wordplay.
I cannot really understand how this works, but
'key' could be 'c' (musical key) and 'c' is found within the answer.
The remaining letters 'humps' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'and' is the link.

Can you help me to learn more?