If returning home, it's best (6)
I believe the answer is:
finest
'best' is the definition.
(the most excellent or fine)
'if returning home' is the wordplay.
'returning' says the letters should be written in reverse.
'home' becomes 'nest' (a bird's home).
'if' backwards is 'fi'.
'fi'+'nest'='FINEST'
'it's' is the link.
(Other definitions for finest that I've seen before include "Most delicate or topmost" , "Infest with the best" , "A1" , "Most splendid" , "Of the highest quality" .)