Measurable impact, so to speak (4)
I believe the answer is:
dent
(Other definitions for dent that I've seen before include "Tend (anag.)" , "Small hollow" , "A cavity" , "Tend to make small depression" , "Hollow; tend (anagram)" .)
I believe the answer is:
dent
(Other definitions for dent that I've seen before include "Tend (anag.)" , "Small hollow" , "A cavity" , "Tend to make small depression" , "Hollow; tend (anagram)" .)