Stern man collecting leftovers (8)
I believe the answer is:
remnants
'leftovers' is the definition.
('remnant' can be a synonym of 'leftover')
'stern man collecting' is the wordplay.
'stern man' can be anagrammed to 'REMNANTS'.
Though, I'm not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for remnants that I've seen before include "Pieces at the end of rolls of fabric" , "Remains" , "Stern man has left-over pieces" , "Pieces of fabric left over" , "Surviving fragments" .)