Abundance of banality? More work required, with one change (10)
I believe the answer is:
cornucopia
'abundance' is the definition.
(a cornucopia of something is an abundance of it)
'of banality? more work required with one change' is the wordplay.
I cannot quite understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
'work' could be 'op' (common abbreviation for 'opus') and 'op' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for cornucopia that I've seen before include "Symbol of plenty" , "Great abundance" , "Wealth" , "Horn of plenty" , "Abundant supply of good things" .)