Cut grass at the Ministry of Works (3)

I believe the answer is:

mow

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'cut grass' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for mow that I've seen before include "Cut down, usually grass" , "'Cut down, hay, say (3)'" , "Cut grass on lawn" , "'Cut, grass say (3)'" , "Cut grass or grain" .)

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

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