Shrewd moving statue (6)
I believe the answer is:
astute
'shrewd' is the definition.
(synonyms)
'moving statue' is the wordplay.
'moving' indicates anagramming the letters.
'statue' with letters rearranged gives 'ASTUTE'.
(Other definitions for astute that I've seen before include "Statue (anag)" , "Sharp-witted" , "on the ball" , "Shrewd, canny" , "Smart and canny" .)