Carpet Power's removed mark (5)
I believe the answer is:
caret
'mark' is the definition.
(caret is a kind of mark)
'carpet power's removed' is the wordplay.
'power' becomes 'p'.
'removed' suggests deleting specific letters.
'carpet' with 'p' removed is 'CARET'.
(Other definitions for caret that I've seen before include "A sign something is missing" , "Proofreading sign for 'Insert'" , "Weeding tool" , "Sign something's lacking" , "Particular mark" .)