A Nature Domain cleric has the Acolyte of Nature feature (PHB, p. 62):
At 1st level, you learn one druid cantrip of your choice. [...]
I picked up shillelagh for my Nature Cleric 1 / Ranger X using this feature, so I can attack with Wisdom. I then realized that Acolyte of Nature is missing a phrase that the bard's Magical Secrets has:
Choose two spells from any class, including this one. [...]
The chosen spells count as bard spells for you [...]
Does the druid cantrip granted by cleric's Nature Domain count as a cleric spell, or is it still a druid spell?
Cleric and druid are both Wisdom-based spellcasters, so my only real concern is the components for shillelagh. If it's a cleric spell, my holy symbol-emblazoned shield takes care of the material components, and the somatic components can be done with my shield hand. If it's a druid spell, I would have to use a component pouch.