In short, no. It’s not possible to send clock from the Deepmind without sending MIDI note data too. There are a couple of workarounds below:
1. If you're using the ARP/SEQ to play a sequence then setting ARP-TO-MIDI to OFF (also on page 3 of the ARP/SEQ menu) the sequence will not be sent over MIDI.
2. Run the Deepmind through MIDI-Ox. Here you can set MIDI-Ox to not forward note information, so that only clock information is sent.