Choppers blowing about hen and grass (8)

I believe the answer is:

gnashers

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'choppers blowing' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'about hen and grass' is the wordplay.
'about' indicates anagramming the letters.
'and' says to put letters next to each other.
'hen' put after 'grass' is 'grasshen'.
'grasshen' anagrammed gives 'GNASHERS'.

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(Another definition for gnashers that I've seen is " teeth".)

I've seen this clue in The Independent.

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