Pinched from Decameron as a line (5)
I believe the answer is:
nasal
'pinched' is the definition.
(I know that pinched can be written as nasal)
'from decameron as a line' is the wordplay.
'from' indicates the answer is hidden within the clue.
'NASAL' is hidden within 'decameron as a line'.
(Other definitions for nasal that I've seen before include "Like some spray" , "To do with nose, say sound" , "Like sounds of m, n, ng" , "of a prominent feature" , "Sounding affected by cold" .)