Fit to cut (4)
I believe the answer is:
trim
This clue is a double definition.
'fit' is the first definition.
(I know that trim is a more specific form of balance)
'cut' is the second definition.
(I know that trim is a type of cut)
'to' acts as a link.
(Other definitions for trim that I've seen before include "Prune or pare" , "To change views expediently" , "Reduce slightly" , "Make neat and smooth by cutting, say hair" , "Light hair-cut in Meath" .)