Intolerant greedy banks reeling, at first (8)
I believe the answer is:
priggish
'intolerant' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'greedy banks reeling at first' is the wordplay.
'greedy' becomes 'piggish' (I've seen this in another clue).
'banks' means one lot of letters goes inside another (bank can mean to surround or border).
'reeling at first' becomes 'r' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'piggish' enclosing 'r' is 'PRIGGISH'.
Can you help me to learn more?
(Other definitions for priggish that I've seen before include "Self-righteous and pedantic" , "Self-righteously superior" , "Smugly narrow-minded" , "smug" , "Sanctimonious" .)