Piece of cloth unusually garish presented to duke (7)
I believe the answer is:
dishrag
'piece of cloth' is the definition.
(dishrag is a kind of piece of cloth)
'unusually garish presented to duke' is the wordplay.
'unusually' indicates anagramming the letters.
'presented to' is a charade indicator (letters next to each other).
'duke' becomes 'd'.
'garish' anagrammed gives 'ishrag'.
'ishrag' put after 'd' is 'DISHRAG'.
(Other definitions for dishrag that I've seen before include "used to clean in kitchen" , "Cleaner" , "Washing-up cloth" , "American tea towel" , "Wiper in the kitchen" .)