Adjusts to fit
I believe the answer is:
adapts
'adjusts to fit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for adapts that I've seen before include "Adjusts to new conditions" , "Changes to suit a new purpose" , "Changes to suit different circumstances" , "Changes to fit new circumstances" , "Alters to suit another purpose" .)