The phrase "small part" means a small portion or section of something, often referring to a smaller component or piece within a larger whole. Full definition
Local government basically refers to processes of government that are not national, but «localized» in smaller parts of the state. (ambergrisCaye.com)
Our ancestors would have benefited from an ability to detect hidden, stationary predators from glimpses of only small parts of them. (discovermagazine.com)
This is a # 1 seller in the tandem stroller category, not in small part due to the very low price, but this stroller also has excellent reviews. (momming.com)