Crossword Genius

Variety of aster eaten by animals (5)

Ross

I believe the answer is:

tares

I'm a little stuck... Click here to teach me about this clue!

Here is my best explanation:

'eaten by animals' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

'variety of aster' is the wordplay.
'variety of' indicates anagramming the letters.
'aster' anagrammed gives 'TARES'.

Can you help me to learn more?