Slight change isn't limiting usage to begin with (6)
I believe the answer is:
insult
'slight' is the definition.
(to slight someone is to insult or disrespect them)
'change isn't limiting usage to begin with' is the wordplay.
'change' indicates anagramming the letters.
'to begin with' says to take the initial letters.
The initial letters of 'limiting usage' is 'lu'.
'isnt'+'lu'='isntlu'
'isntlu' is an anagram of 'INSULT'.
(Other definitions for insult that I've seen before include "Show contempt to" , "Disrespectful remark" , "A deliberately offensive remark" , "Speak or act inm abusive way" , "Speak or act in way designed to hurt" .)