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You have to specify the remapping directly where the gazebo node is started (Internally, the XML-based remapping is converted to arguments provided to the executable). So the one option is to copy the empty_world.launch launch file from gazebo_ros and add the appropriate remapping, e.g. change this part to:

<node name="gazebo" pkg="gazebo_ros" type="$(arg script_type)" respawn="false" output="screen"
    args="$(arg command_arg1) $(arg command_arg2) $(arg command_arg3) -e $(arg physics) $(arg extra_gazebo_args) $(arg world_name)">
    <remap from="tf" to="tf_remapped_away" />
  </node>
</node>

As another (potential) option, the original empty_world.launch also provides a extra_gazebo_args argument, that can be used to provide additional arguments. I tried manually adding the remapping there (for my test the /clock topic) This however doesn't work, likely due to the duplicate := (would probably need to be escaped somehow):

roslaunch gazebo_ros empty_world.launch extra_gazebo_args:=/clock:=/clock_remapped_away