Army group threshing crops (5)

I believe the answer is:

corps

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

'army group' is the definition.
(I've seen this in another clue)

'threshing crops' is the wordplay.
'crops' anagrams to 'CORPS'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for corps that I've seen before include "Military unit" , "Military body" , "Large army group" , "Specialised mil. body" , "Part of an army" .)

I've seen this clue in The Globe and Mail.

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