Sweet cone for us, and gala dancing (4,5)
I believe the answer is:
loaf sugar
'sweet cone' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'for us and gala dancing' is the wordplay.
'and' says to put letters next to each other.
'dancing' indicates anagramming the letters.
'for'+'us'='forus'
'forus' after 'gala' is 'galaforus'.
'galaforus' with letters rearranged gives 'LOAF-SUGAR'.
Can you help me to learn more?
(Another definition for loaf sugar that I've seen is " it may be broken into sweet little lumps".)