Implement also gets left (4)
I believe the answer is:
tool
'implement' is the definition.
(I know that implement can be written as tool)
'also gets left' is the wordplay.
'also' becomes 'too' (synonyms).
'gets' means one lot of letters go next to another.
'left' becomes 'l' (common abbreviation).
'too'+'l'='TOOL'
(Other definitions for tool that I've seen before include "Device, implement" , "Pawn" , "Cat's-paw; impress design on" , "Practical implement" , "Instrument, implement" .)