Implement: also utensil, ultimately (4)
I believe the answer is:
tool
'implement' is the definition.
(I've seen this before)
'also utensil ultimately' is the wordplay.
'also' becomes 'too' ('too' can be a synonym of 'also').
'ultimately' indicates one should take the final letters.
The last letter of 'utensil' is 'l'.
'too'+'l'='TOOL'
(Other definitions for tool that I've seen before include "Appliance" , "Pawn" , "Cat's-paw; impress design on" , "Maybe saw" , "Gun" .)