Crossword Genius

Too large to implement (4)

Ross

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.
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