Solved clue about new relative (5)
I believe the answer is:
uncle
'relative' is the definition.
(uncle is a kind of relative)
'solved clue about new' is the wordplay.
'solved' is an anagram indicator (the anagram must be solved).
'about' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'clue' is an anagram of 'ucle'.
'ucle' placed around 'n' is 'UNCLE'.
(Other definitions for uncle that I've seen before include "older relative" , "one who's taken the pledge" , "Slang name for pawnbroker" , "Law enforcement body" , "A parent's brother" .)