What's new in mowing (5)

I believe the answer is:

swath

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

'in mowing' is the definition.
I can't judge whether this defines the answer.

'what's new' is the wordplay.
'new' indicates an anagram.
'whats' with letters rearranged gives 'SWATH'.

Can you help me to learn more?

(Another definition for swath that I've seen is " cut in field".)

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

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