Balance to settle around mid-January (7)
I believe the answer is:
residue
'balance' is the definition.
(I know that balance is a class)
'settle around mid-january' is the wordplay.
'settle' becomes 'reside' (I've seen this before).
'around' means one lot of letters goes inside another.
'mid' indicates the central letters.
The middle letter of 'january' is 'u'.
'reside' placed around 'u' is 'RESIDUE'.
'to' acts as a link.
(Other definitions for residue that I've seen before include "What is left over, remainder (7)" , "Dire use of what is left over" , "Remains to be seen" , "rest" , "Stuff left over" .)