As i see it, this is purely a matter between you and your club. Insurers have decided to deal with the claim, so liability is not an issue. Insurers will retrieve the excess from whoever is named on the policy, which is probably the club. What you need to establish, is that you have agreed to meet the excess in the event of a claim arising against the club due to your negligence, when you agreed to the terms and conditions of membership. Check the terms and conditions of your membership for the answer.