Lacking grace in movement (6)
I believe the answer is:
clumsy
'lacking grace in movement' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for clumsy that I've seen before include "Awkward and unskilful" , "'Awkward, ungainly (6)'" , "Cack-handed" , "Maladroit" , "Not dextrous" .)