It’s another way to relax (3)
I believe the answer is:
sit
'relax' is the definition.
(sitting is a type of relaxing)
'it's another way' is the wordplay.
'another way' indicates an anagram.
'its' anagrammed gives 'SIT'.
'to' is the link.
(Other definitions for sit that I've seen before include "Take a pew, an exam" , "(Of bird) stay on nest" , "Be seated" , "Take a chair" , "as magistrates do" .)