Go and give nothing to the new fund - it's amusing (4,3)

'amusing' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'go and give nothing to the new fund' is the wordplay.
'and' says to put letters next to each other.
'give' means one lot of letters go next to another.
'nothing' becomes 'O' (looks like zero - 0).
'to the new' indicates an anagram.
'fund' with letters rearranged gives 'dfun'.
'go'+'o'+'dfun'='GOOD FUN'

'it's' acts as a link.

Can you help me to learn more?