Result is certain right away (5)
I believe the answer is:
issue
'result' is the definition.
(I've seen this before)
'is certain right away' is the wordplay.
'certain' becomes 'sure' (synonyms).
'right' becomes 'r' (common abbreviation).
'away' suggests deleting specific letters.
'sure' with 'r' taken out is 'sue'.
'is'+'sue'='ISSUE'
(Other definitions for issue that I've seen before include "important point" , "Offspring; problem" , "Distribute for sale/use" , "The children to come forth" , "Supply" .)