Too large to implement (4)

I believe the answer is:

tool

'to implement' is the definition.
(tool is a kind of implement)

'too large' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'too'+'l'='TOOL'

(Other definitions for tool that I've seen before include "Pawn" , "Device used for work" , "Instrument, implement" , "Hand implement" , "organ" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.