Family member’s containers taken across lake by crew (8)
I believe the answer is:
clansman
'family member's' is the definition.
'containers taken across lake by crew' is the wordplay.
'containers' becomes 'cans' (can is a kind of container).
'taken across' means one lot of letters goes inside another.
'lake' becomes 'l'.
'by crew' becomes 'man' (I've seen this before. I am not sure about the 'by' bit.**).
'cans' going around 'l' is 'clans'.
'clans'+'man'='CLANSMAN'
(Other definitions for clansman that I've seen before include "Scot" , "Member of Scots family group" , "Member of tribe maybe" .)