Revolutionary soldiers love fanatical submariner (4)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

MEN (soldiers) reversed [Revolutionary] then O (love) . Why fanatical? I’ve not read either of the two books in which NEMO appears, but a quick Wiki check reveals that “Jules Verne portrays Nemo as a man consumed by grief, vengeance, and hatred of oppression, which drives him to extremes.”