Formality of reworked charts (6)
I believe the answer is:
starch
'formality' is the definition.
(being excessively formal or stiff)
'reworked charts' is the wordplay.
'reworked' indicates anagramming the letters.
'charts' with letters rearranged gives 'STARCH'.
'of' is the link.
(Other definitions for starch that I've seen before include "Stiffener in the laundry" , "Stiffening carbohydrate" , "Formality - makes things stiff" , "Potato, rice constituent; a stiffener" , "Stiffness of manner" .)