Fresh or dried Garlic
When a recipe calls for a clove of garlic it almost certainly means fresh. If it was asking for dried it would call for a weight or a volume measurement as dried usually does not come in cloves. One clove isn't particularly helpful though, as garlic cloves vary widely in size depending on the variety of garlic and which part of the bulb you get the clove from. I'd say pick one clove from the outside of a bulb, or 2 small ones from the inside. 

Although drying fruits and vegetables usually intensifies flavors, for me drying garlic doesn't do it any favors - it seems to lose power and complexity of flavor, so I'd go fresh every time.