Formal revision of charts at the start of the year (7)
I believe the answer is:
starchy
'formal' is the definition.
(similar in meaning)
'revision of charts at the start of the year' is the wordplay.
'revision of' is an anagram indicator.
'at the start of' indicates taking the first letters (I've seen 'at the start' mean this).
The first letter of 'year' is 'y'.
'charts' with letters rearranged gives 'starch'.
'starch'+'y'='STARCHY'
(Other definitions for starchy that I've seen before include "Stiff and formalistic" , "Conventional" , "Stiff, formal" , "Stiff, like potatoes" , "Unbending" .)