An ornamental drapery changes hands over one disagreement (8)
I believe the answer is:
variance
'disagreement' is the definition.
(synonyms)
'an ornamental drapery changes hands over one' is the wordplay.
I cannot really understand how this works, but
'an' could be 'i' (Roman numeral for one) and 'i' is found within the answer.
'one' could be 'an' (I've seen this in other clues) and 'an' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for variance that I've seen before include "Not the main attraction" , "Discrepancy, divergence" , "Difference, discrepancy" , "disagreement" , "Dissension" .)