Serious eastern winds (7)
I believe the answer is:
earnest
'serious' is the definition.
(similar in meaning)
'eastern winds' is the wordplay.
'winds' is an anagram indicator (the letters wind around).
'eastern' with letters rearranged gives 'EARNEST'.
(Other definitions for earnest that I've seen before include "Oscar Wilde wrote ''The importance of Being . . . . . . . '' (7)" , "businesslike" , "Serious in intention" , "Intensely serious; token" , "money involved in contract" .)