Lawn trimmer (5)
'lawn trimmer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for edger that I've seen before include "Someone moving slowly" , "Gardening tool" , "Trimming tool" .)
(Other definitions for mower that I've seen before include "Gardening equipment" , "Tool for cutting grass" , "Grass-cutter" , "Patrick _; Rodney Blackstock in Emmerdale" , "Gardening machine" .)