15 down
Material
bad
–
hence
lousy
for
covering
(8)
Material bad – hence lousy for covering (8)
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The definition is at the beginning of the clue.
How the clue works
Material is the definition. Take ILL for "bad" and put it inside an anagram of HENCE (with "lousy" as the anagram indicator and "for covering" telling you to wrap the letters around ILL), giving CHEN-ILL-E.