Language used by whimsical MC is ignored for a change (7)
I believe the answer is:
swahili
'language' is the definition.
(Swahili is an example)
'whimsical mc is ignored for a change' is the wordplay.
'is ignored' suggests deleting specific letters.
'for a change' indicates anagramming the letters.
'whimsical' with 'mc' removed is 'whisial'.
'whisial' with letters rearranged gives 'SWAHILI'.
'used by' acts as a link.
(Other definitions for swahili that I've seen before include "Language widely used in East Africa" , "heard in parts of Africa" , "African people" , "Common language in East Africa" , "Widely-spoken Bantu language" .)