I use my Stormcaller, tbh. Clearing out enemies is one of the biggest parts in what I normally do, but I guess other than that, the support comes with what I do (be a meat shield, cover fire, dying for a revive, clearing enemies so we don't have to wipe, etc). Most people would say it's not in any way a support subclass, but I believe that's what the Warlock was made for was support.