It was Christmas Eve when Pat Phelan saw $15 million in venture debt land in the bank account of the cosmetic group he co-founded called the Sisu Clinic. The money came from Structural Capital, a Californian financier best known for having previously backed Noom, Manscaped and Beauty Counter. “There were an awful lot of legals,” he said. “It is their first Irish investment and I think they are going to be doing more.”  Phelan said Sisu Clinic went on a roadshow last year to raise fresh funding and it looked at both debt and equity. “We were inundated between private…