Conspicuous apartment accommodating elderly relative (8)
I believe the answer is:
flagrant
'conspicuous' is the definition.
(thesaurus)
'apartment accommodating elderly relative' is the wordplay.
'apartment' becomes 'flat' ('flat' can be a synonym of 'apartment').
'accommodating' means one lot of letters goes inside another.
'elderly relative' becomes 'gran' (I've seen this before).
'flat' going around 'gran' is 'FLAGRANT'.
(Other definitions for flagrant that I've seen before include "Shocking" , "Patent" , "Openly outrageous" , "Blatant, outrageous" , "Crying" .)