The most common and most likely answer to this crossword clue is the 7 letter word MESSIAH
I've seen this crossword clue in Independent
M
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S
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H
More clues leading to the result MESSIAH
- Liberator’s shame is recollected
- Champion footballer visiting a hospital
- Footballer Lionel, a hot favourite at Christmas?
- Shame is unusual for Jesus?
- Tees backing interference over article he saves
- Saviour of old Thailand briefly trapped in net
- Saviour, I am he, struggling to rescue ship
- Argentine trained to shoot Admiral Horatio primarily, as Lord
- Lionel, a hot favourite at Christmas?
- Person expected to deliver Ashes — I’m out!
Buddy explains!

The straight part
We know that "Saviour" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case saviour = messiah.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MESSIAH mean?
MESSIAH noun- (Abrahamic tradition) The one who is ordained by God to lead the people of Israel, believed by Christians and Muslims to be Jesus Christ.
- A similar religious figure or awaited divine ruler, such as the Islamic Mahdi.
- An extremely powerful figure.