Theres a common fault in the clusters for this model.
Mine did it along with the abs light, on damp mornings, it would be on constantly, summer time it was fine.
I put another cluster in over the winter to prove and it was fine, but as the mileage is stored in the cluster, not the ecu, the mileage for my car showed 100k more than it had done so i removed the abs led and live the the handbrake light on!