Suckers on Sambucus Nigra - remove?

My 3 year old sambucus nigra (which I've grown from a cutting), has a straight branch appear from the ground next to the actual plant I planted. I'm assuming this is a sucker? Should I remove it or just leave it? It's been there since last year so grown quite a bit.

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My sambucus has about 15 such stems now. Each autumn or early spring I cut out about 1/3 of the oldest stems and either prune or leave the others.
The flowers form on last year's growth
Wisdom is not putting it in a fruit salad.