Huge scrape, it's said (5)
I believe the answer is:
great
'huge' is the definition.
(I've seen this before)
'scrape it's said' is the wordplay.
'scrape' becomes 'grate' (synonyms).
'it's said' shows a homophone (sound like).
'grate' is a homophone of 'GREAT'.
(Other definitions for great that I've seen before include "Marvellous; big" , "cracking" , "Very large in size, quantity, etc." , "Huge or outstanding" , "'Goodness gracious -- -- -- --' (pop song)" .)