Get lean in order to be graceful (7)
I believe the answer is:
elegant
'be graceful' is the definition.
(synonyms)
'get lean in order' is the wordplay.
'in order' indicates anagramming the letters (the letters in a new order).
'get'+'lean'='getlean'
'getlean' with letters rearranged gives 'ELEGANT'.
'to' is the link.
(Other definitions for elegant that I've seen before include "A gentle sort of stylish appearance" , "Polished" , "Modish" , "Handsome" , "Chic; smart" .)