Sweet to see so much dancing, pop joining in (9,6)
I believe the answer is:
chocolate mousse
'sweet' is the definition.
(chocolate mousse is a kind of sweet)
'see so much dancing pop joining in' is the wordplay.
I cannot quite understand how this works, but
'see' could be 'c' (the word for the letter, according to Chambers) and 'c' is present in the answer.
'pop' could be 'cola' (fizzy pop) and 'cola' is present in the answer.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Another definition for chocolate mousse that I've seen is " oily sea foam".)