A present from the birds which love elderberries and 'deposit' the seeds later so they can appear anywhere. If you rub a leaf and it smells quite pungent, it is Elder (Sambucus nigra, which is what I think it is.) Good for hedgerows, not really a garden-worthy tree.
A trowel in the hand is worth a thousand lost under a bush.
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I think mine looks ok🙂