Big deal to endow banks with staggering wealthiness? (4,4,2,3)

'big deal' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'endow banks with staggering wealthiness?' is the wordplay.
'banks' means to remove the middle letters (the sides or banks of the word).
'with' says to put letters next to each other.
'staggering' indicates anagramming the letters (letters stagger around).
'endow' with its middle removed is 'ew'.
'wealthiness' anagrammed gives 'whatelseisn'.
'ew' put after 'whatelseisn' is 'WHAT ELSE IS NEW'.

'to' acts as a link.

Can you help me to learn more?