locality of reference

[akshay sumant]

While reading about "Adaptive replacement cache" i came across this line...
"LRU maintains cache pages based on their most recent access times and
replaces the least recently used pages. While LRU is simple to implement and
captures the "clustered locality of reference" that is common in many
workloads"
What is meaning of clustered locality of reference?? i know about spatial
and temporal locality of reference.... but didn't got this one..
Pls explain.. Thank you