Implement silent reforms after mid-January (7)
I believe the answer is:
utensil
'implement' is the definition.
(utensil is a kind of implement)
'silent reforms after mid-january' is the wordplay.
'reforms' indicates anagramming the letters.
'after' means one lot of letters go next to another.
'mid' indicates the central letters.
The middle of 'january' is 'u'.
'silent' with letters rearranged gives 'tensil'.
'tensil' after 'u' is 'UTENSIL'.
(Other definitions for utensil that I've seen before include "Handy kitchen tool" , "Useful tool" , "knife, maybe" , "one's employed in the kitchen" , "Implement for practical use" .)