One thus delayed daughter getting cut off (8)
I believe the answer is:
isolated
'cut off' is the definition.
(thesaurus)
'one thus delayed daughter' is the wordplay.
'one' becomes 'i' (Roman numeral).
'thus' becomes 'so' ('so' can be a synonym of 'thus').
'delayed' becomes 'late' (I've seen this before).
'daughter' becomes 'd'.
'i'+'so'+'late'+'d'='ISOLATED'
'getting' is the link.
(Other definitions for isolated that I've seen before include "Remote; lonely" , "individual" , "Alone, set apart" , "Off the beaten track" , "Alone, apart, detached" .)