At home wearing shoddy stuff — a flaw (5)
I believe the answer is:
taint
'a flaw' is the definition.
(thesaurus)
'at home wearing shoddy stuff' is the wordplay.
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'wearing' means one lot of letters goes inside another.
'shoddy stuff' becomes 'tat' (I've seen this before).
'in' put within 'tat' is 'TAINT'.
(Other definitions for taint that I've seen before include "Contaminate, pollute" , "Contaminating influence" , "Defect - contamination" , "Tarnish" , "It isn't commonly" .)