Take the plunge and attack ignorant extremists (2,3,2)

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

'attack ignorant extremists' is the wordplay.
'attack' becomes 'go for' (go for can mean to attack).
'extremists' means to remove the middle letters (letters on the extreme ends of the word).
'ignorant' with its middle removed is 'it'.
'gofor'+'it'='GO FOR IT'

'and' acts as a link.

Can you help me to learn more?