The most common and most likely answer to this crossword clue is the 13 letter word AWE-INSPIRING
I've seen this crossword clue in The Guardian
A
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More clues leading to the result AWE-INSPIRING
Buddy explains!
The straight part
We know that "wonderful/wonderful" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wonderful/wonderful = awe-inspiring.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 AWE-INSPIRING mean?
AWE-INSPIRING verb- To cause awe in; to make awed.
- Inspiring awe; awesome.