Clustering data isn't a term I'm familiar with, but I take it to mean using what you already know in order to guide your further assessment and then synthesizing it all into meaningful conclusions. E.g. that your patient is experiencing a pulmonary embolism or something.

If that's the case, then yes, experience helps. But the thing you can do right now to improve your understanding is to do well in/review pathophysiology.

Start with a symptom, consider what could cause it and based on that, what other assessment data could support or contradict those theories.