Regarding ruin, bleak winds extraordinary (10)
I believe the answer is:
remarkable
'extraordinary' is the definition.
(similar in meaning)
'regarding ruin bleak winds' is the wordplay.
'regarding' becomes 're'.
'ruin' becomes 'mar' (I've seen this before).
'winds' is an anagram indicator.
'bleak' anagrammed gives 'kable'.
're'+'mar'+'kable'='REMARKABLE'
(Other definitions for remarkable that I've seen before include "Striking" , "unusual" , "Noteworthy" , "surprising?" , "Extraordinary" .)