だけあって means 'precisely because' or 'being the case that', and it points out that the result is natural or expected given the reason. It often carries a nuance of appreciation or admiration. For example, if someone is famous, you expect their performance to be good. You can use it to explain why something is so good, bad, or impressive based on a known fact.

Use it when you want to link a cause (the basis) to an effect that matches it. The cause is usually something notable: a person's position, experience, or quality. The effect is often something you have directly observed or experienced. The pattern is slightly formal and more common in written Japanese, but it can be used in speaking when you want to sound thoughtful or emphatic.

A typical structure is: X は [reason] だけあって、[result]. For example, さすがに ('as expected') is often used together with this pattern to strengthen the nuance: さすがにプロだけあって、歌が上手い。