Such clothing fits Una badly (7)
I believe the answer is:
fustian
'such clothing' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'fits una badly' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'fits'+'una'='fitsuna'
'fitsuna' is an anagram of 'FUSTIAN'.
Can you help me to learn more?
(Other definitions for fustian that I've seen before include "Hard-wearing twilled cloth -- it's faun (anag)" , "Bombastic (style)" , "Thick twilled cotton cloth, or pompous language" , "Hard-wearing fabric; pompous language" , "Bombast" .)