Scuffed first pair put inside to be thrown away (8)
I believe the answer is:
scrapped
'thrown away' is the definition.
(scrapping is a kind of throwing away)
'scuffed first pair put inside' is the wordplay.
'scuffed' becomes 'scraped' (I can't explain this - if you can you should believe this answer much more).
'first pair' becomes 'p' (sst letter of 'pair').
'put inside' indicates putting letters inside.
'scraped' going around 'p' is 'SCRAPPED'.
'to be' is the link.
Can you help me to learn more?
(Other definitions for scrapped that I've seen before include "abandoned in a heap?" , "Abandoned - had a fight" , "Disposed of something useless" , "Given axe" , "Discarded as useless" .)