Refers to a small, dense group of things growing or gathered together, such as plants, trees, or people. Often used for a copse of trees or a cluster of flowers.
There is a clump of pine trees on the hill.
A cluster of violets was blooming by the roadside.
Compound of 一 (ひと, 'one') and 叢 (むら, 'cluster'). The reading むら is an old Japanese word for a group or cluster.