Mosaic sale settled after a fashion (11)
I believe the answer is:
tessellated
'mosaic' is the definition.
(synonyms)
'sale settled after a fashion' is the wordplay.
'after a fashion' indicates an anagram (letters re-fashioned).
'sale'+'settled'='salesettled'
'salesettled' with letters rearranged gives 'TESSELLATED'.
(Other definitions for tessellated that I've seen before include "as plane may be filled up" , "came together perfectly" , "Decorated with mosaics" , "mosaic being so?" , "fitted together perfectly" .)