To erase something like a bitmap call delete on the item. Assuming your Canvas tag is $canvar and your item tag it $bittag (as in the previous [10.1] question) then the call proceeds like:
    $canvar -> delete($bittag);
This is of course useful in a callback. For example to configure a
Button to do your deletion for you you could say something like:
    $main->Button(-text   => 'clear', 
                  -command=>sub{$canvar -> delete($bittag)}
                 )->pack;
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