Crossword Genius

Thoroughbred animal eating seeds regularly with grass (9)

Ross

I believe the answer is:

pedigreed

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

'thoroughbred' is the definition.
(I know that thoroughbred can be written as pedigreed)

'animal eating seeds regularly with grass' is the wordplay.
I cannot quite see how this works, but
'grass' could be 'reed' (type of grass plant) and 'reed' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Times.
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