Assuming the data structure given above

## your best bet
splice @{ $data->{TRAPS}->{TRAP_LIST} }, 1, 1;

## resets index to original undefined state
delete $data->{TRAPS}->{TRAP_LIST}->[1];

## shortens the array (generally not ideal)
$#{ $data->{TRAPS}->{TRAP_LIST} }--;
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See. splice() for more info and Understanding splice for a good tutorial.
HTH

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broquaint