Somehow graceful, having smile so out of the ordinary (7)
I believe the answer is:
lissome
'somehow graceful' is the definition.
(lissome means supple)
'smile so out of the ordinary' is the wordplay.
'out of the ordinary' is an anagram indicator (letters in an unusual order).
'smile'+'so'='smileso'
'smileso' is an anagram of 'LISSOME'.
'having' acts as a link.
(Other definitions for lissome that I've seen before include "Thin - supple - graceful" , "Willowy" , "Lithe; nimble" , "Moving supply" , "Slim, supple, graceful" .)