Family in dilapidated barge parting (8)
I believe the answer is:
breaking
'parting' is the definition.
(breaking is a kind of parting)
'family in dilapidated barge' is the wordplay.
'family' becomes 'kin' ('kin' can be a synonym of 'family').
'in' is an insertion indicator.
'dilapidated' indicates anagramming the letters.
'barge' anagrammed gives 'breag'.
'kin' going within 'breag' is 'BREAKING'.
(Other definitions for breaking that I've seen before include "Fracturing" , "Going first at snooker" , "Interrupting" , "falling apart" .)