Clover or trefoil are common names for plants of a genus that consists of about 300 species of plants.
The genus has a cosmopolitan distribution; the highest diversity is found in the temperate Northern Hemisphere.
But many species also occur in South America and Africa, including at high altitudes on mountains in the tropics.
They are small annual, biennial, or short-lived perennial herbaceous plants.
Clover tend to be evergreen in color. (source)
So can hamsters eat clover?
Yes they can, but make sure that they are not sprayed with fertilizer or they have parasites.
Don’t give them too much as they may get diarrhea, small amounts is recommended.