Lowers crate idly at ground (5,6)

I believe the answer is:

dairy cattle

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

'lowers crate idly at ground' is the definition.
I can't tell whether this definition defines the answer.

'crate idly at ground' is the wordplay.
'ground' is an anagram indicator ('grind' the letters into a new form).
'crate'+'idly'+'at'='crateidlyat'
'crateidlyat' anagrammed gives 'DAIRY CATTLE'.

Can you help me to learn more?

(Other definitions for dairy cattle that I've seen before include "Milk producers" , "farm animals" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app