Bank associated with the Spanish nonsense (8)
I believe the answer is:
doggerel
'nonsense' is the definition.
(I've seen this before)
'bank associated with the spanish' is the wordplay.
'bank' becomes 'dogger' (I have seen 'A bank' mean 'dogger' so perhaps 'bank' could also mean 'dogger').
'associated with' means one lot of letters go next to another.
'the spanish' becomes 'el'.
'dogger'+'el'='DOGGEREL'
(Other definitions for doggerel that I've seen before include "Nonsense verse" , "William McGonagall's kind of poetry?" , "Irregular comic verse" , "Very bad poetry or verse" , "Badly written poetry" .)