Simple men thinking about tool (9)

I believe the answer is:

implement

'tool' is the definition.
(implement can mean a tool or utensil)

'simple men thinking about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'IMPLEMENT' is hidden within 'simple men thinking'.

(Other definitions for implement that I've seen before include "Put into action - utensil" , "Execute" , "appliance" , "Perform" , "Complete" .)

I've seen this clue in The Telegraph.

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