Exact meaning of the term "clutch"
A clutch usually refers to all the eggs for a single reproductive event or laying or location. It can mean either all those laid by one organisms in one event or all those laid in a population in a single time and place. Which is usually clear in context. 

Even just for an individual it is a bit vague however and can refer to one laying or multiple layings if they happen close together in time. 

There is also a usage difference by specialization, agricultural scientists tend to favor a boarder usage for instance.