Tiny flaws exposed part of one's extended family (2-3)
I believe the answer is:
in-law
'extended family' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'tiny flaws exposed part of one's' is the wordplay.
I cannot quite see how this works, but
'part' could be 'la' (la is a kind of part) and 'la' is present in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
This explanation may well be incorrect...
(Other definitions for in-law that I've seen before include "Meghan to Harry's family?" , "Near relative" , "Family member, by marriage" , "Relation by marriage" , "Spouse's relation" .)