Acclimatises; adjusts to (6)
I believe the answer is:
adapts
I believe this clue is a double definition.
'acclimatises' is the first definition.
(I've seen this in another clue)
'adjusts to' is the second definition.
(I've seen this in another clue)
(Other definitions for adapts that I've seen before include "Adjusts for a new use" , "Alters to fit" , "Changes to suit a new purpose" , "Changes to suit new circumstances" , "Makes suitable for a new use" .)