7 down
Lock
away
troublemaker,
absolutely
not
set
up
(8)
Lock away troublemaker, absolutely not set up (8)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Lock away, meaning to imprison. You've got IMP (a troublemaker) followed by NO SIR (absolutely not) written upwards ('set up', since it's a down clue), giving you RISON to tag onto the end.