Wake devils at the farm (9)

I believe the answer is:

aftermath

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

'wake' is the definition.
(I know that wake can be written as aftermath)

'devils at the farm' is the wordplay.
'at the farm' can be anagrammed to 'AFTERMATH'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for aftermath that I've seen before include "Subsequent circumstances" , "Second crop" , "Second possible harvest" , "Consequences of a bad event" , "Subsequent consequences" .)

I've seen this clue in the Sydney Morning Herald.

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