These pants can be made into coat (5)
I believe the answer is:
sheet
'coat' is the definition.
(thesaurus)
'these pants' is the wordplay.
'pants' indicates anagramming the letters (UK informal term for 'nonsense' or 'rubbish').
'these' anagrammed gives 'SHEET'.
'can be made into' is the link.
(Other definitions for sheet that I've seen before include "Piece of linen, paper, etc" , "Whence to sing hymns?" , "Item of bed linen like these" , "Bed cover" , "newspaper" .)