Do the lawn (3)
I believe the answer is:
mow
'do the lawn' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mow that I've seen before include "Cut (e.g. grass)" , "Cut grass on lawn" , "Scythe" , "Cut down, usually grass" , "'Cut down, hay, say (3)'" .)