Scope revealed by Oscar, standing in in goal (8)
I believe the answer is:
ambition
'goal' is the definition.
(I've seen this before)
'scope revealed by oscar standing in' is the wordplay.
'scope' becomes 'ambit' (synonyms).
'revealed' indicates an anagram.
'by' says to put letters next to each other.
'standing' indicates taking the first letters.
The first letter of 'oscar' is 'o'.
'o' after 'in' is 'ino'.
'ino' with letters rearranged gives 'ion'.
'ambit'+'ion'='AMBITION'
'in' acts as a link.
(Other definitions for ambition that I've seen before include "Desire to achieve success" , "Cherished aspiration" , "Strong desire to achieve, fame or fortune" , "A determination to succeed" , "Strong desire for success" .)