Stop tutor with BSc that's forged (8)
I believe the answer is:
obstruct
'stop' is the definition.
(I know that stop is a more specific form of obstruct)
'tutor with bsc that's forged' is the wordplay.
'with' means one lot of letters go next to another.
'that's forged' indicates anagramming the letters.
'tutor'+'bsc'='tutorbsc'
'tutorbsc' is an anagram of 'OBSTRUCT'.
(Other definitions for obstruct that I've seen before include "Get in the way of" , "Hinder or impede" , "Block, hinder" , "Prevent or hinder movement" , "Check" .)