Farmers may combine to get it in (7)

I believe the answer is:

harvest

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'farmers may' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for harvest that I've seen before include "Produce" , "Crop gathering" , "Gather in (a crop)" , "Time to gather the crops" , "Seasonal yield" .)

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

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