The most common and most likely answer to this crossword clue is the 9 letter word BISMILLAH
I've seen this crossword clue in The Guardian
B
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S
M
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L
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A
H
Buddy explains!

The straight part
We know that "blessing perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case blessing perhaps = bismillah.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 BISMILLAH mean?
BISMILLAH interjection- Used in belief of blessing the speaker's imminent action, especially prior to eating and drinking; sometimes used as an apotropaic. In the name of Allah!
- Ellipsis of Bismillahi ar-Rahmani ar-Rahim