Bizarre clue about northern relative (5)
I believe the answer is:
uncle
'relative' is the definition.
(I know that relative can be written as uncle)
'bizarre clue about northern' is the wordplay.
'bizarre' indicates an anagram.
'about' means one lot of letters goes inside another.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'clue' is an anagram of 'ucle'.
'ucle' going around 'n' is 'UNCLE'.
(Other definitions for uncle that I've seen before include "One receiving pawn" , "takes the pledge" , "Dad's brother" , ". . . . . Sam, the US government" , "Male family member" .)