Family butcher's first to get into trouble (6)
I believe the answer is:
tribal
'family' is the definition.
(both can mean relating to one's family)
'butcher's first to get into trouble' is the wordplay.
'first' indicates taking the first letters.
'to get into' is an insertion indicator.
'trouble' becomes 'trial' (trial is a kind of trouble**).
The first letter of 'butchers' is 'b'.
'b' going into 'trial' is 'TRIBAL'.
(Other definitions for tribal that I've seen before include "To do with racial groups, especially in primitive cultures" , "Characterised by strong group loyalty" , "Like some groups of people" , "between extended families" , "concerning an ethnic group" .)