One meets very tardy daughter, standing apart (8)
I believe the answer is:
isolated
'standing apart' is the definition.
(something isolated is standing apart)
'one meets very tardy daughter' is the wordplay.
'one' becomes 'I' (Roman numeral).
'meets' says to put letters next to each other.
'very' becomes 'so' (both can mean 'extremely').
'tardy' becomes 'late' (synonyms).
'daughter' becomes 'd' (genealogical abbreviation).
'i'+'so'+'late'+'d'='ISOLATED'
(Other definitions for isolated that I've seen before include "Set apart from others" , "Separated from others" , "Placed apart from others" , "hard to find" , "individual" .)