It's a different way to relax (3)
I believe the answer is:
sit
'relax' is the definition.
(sitting is a type of relaxing)
'it's a different way' is the wordplay.
'a different way' indicates an anagram.
'its' anagrammed gives 'SIT'.
'to' is the link.
(Other definitions for sit that I've seen before include "Take a seat; pose" , "Use a chair" , "Model" , "Perch" , "Take (an examination)" .)