6 across
I
request
silence
during
plot
slip-up
(6)
I request silence during plot slip-up (6)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition is slip-up, meaning a minor accident or mistake. You've got "I" and "SH" (your request for silence) tucked inside MAP (plot), giving you M-I-SH-AP.