Clue solved about new relative (5)
I believe the answer is:
uncle
'relative' is the definition.
(I know that relative can be written as uncle)
'clue solved about new' is the wordplay.
'solved' indicates anagramming the letters (the anagram must be solved).
'about' is an insertion indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'clue' anagrammed gives 'ucle'.
'ucle' enclosing 'n' is 'UNCLE'.
(Other definitions for uncle that I've seen before include "Brother of one's parent" , "Male relation; pawnbroker" , "Dad's brother" , "Family relation" , "Law enforcement body" .)