Crew shod as farm workers (8)

I believe the answer is:

cowherds

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'workers' is the definition.
(cowherd is a kind of worker)

'crew shod as farm' is the wordplay.
'crew shod' can be anagrammed to 'COWHERDS'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

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

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