Sack most of them at dance, including Charlie (3,4)

'sack' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'most of them at dance including charlie' is the wordplay.
'most of' means to remove the last letter.
'at' is a charade indicator (letters next to each other).
'dance' becomes 'hop' (hop is a kind of dance).
'including' is an insertion indicator.
'charlie' becomes 'C' (phonetic alphabet: alpha, bravo, charlie etc.).
'them' with its final letter taken off is 'the'.
'the'+'hop'='thehop'
'thehop' placed around 'c' is 'THE CHOP'.

Can you help me to learn more?