A dirty screen falls within "working, as is". A non-operational film counter might, under the minimal standards of ebay, fall in that category as well.
But a film winder that doesn't work means the camera isn't "working". So if the suggestions in these responses don't work, contact the seller and let him know his description is not accurate and that you will leave objective negative feedback to that effect. He might offer some settlement but, more importantly, he'll be penalized to some small degree (by negative feedback) for misrepresenting his item.