Lawn care tool (7)
I believe the answer is:
aerator
'lawn care tool' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aerator that I've seen before include "One may emit much gas" , "Maybe fork" , "Device making bubbles in a fish tank" , "Tropical fish tank pump" , "Device such as used in tropical fish tanks" .)