Man who fought with family member rejected excuses (6)
I believe the answer is:
alibis
'excuses' is the definition.
(alibiing is a kind of excusing)
'man who fought with family member rejected' is the wordplay.
I cannot really see how this works, but
'man' could be 'ali' and 'ali' is found in the answer.
The remaining letters 'bis' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for alibis that I've seen before include "Defences of being elsewhere at times of crimes" , "Defences in court" , "Defences to charges - was elsewhere at the time" , "Excuses" , "Defences - was elsewhere at time of crimes" .)