Implements as well left self-starting (5)
I believe the answer is:
tools
'implements' is the definition.
(tool is a kind of implement)
'as well left self-starting' is the wordplay.
'as well' becomes 'too' (both can mean 'also').
'starting' indicates taking the first letters.
The first letters of 'left self' is 'ls'.
'too'+'ls'='TOOLS'
(Other definitions for tools that I've seen before include "Hand implements" , "workman's implements" , "Implements used in one's job" , "Devices or implements, as of the trade" , "'A bad workman blames his . . . . .'" .)