He isn't bothered by the sailor's "It's your destiny" (2,3,5)

'your destiny' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'he isn't bothered by the sailor's' is the wordplay.
'bothered' indicates an anagram.
'by' says to put letters next to each other.
'the sailor's' becomes 'tars' (slang term for a sailor).
'he'+'isnt'='heisnt'
'heisnt' is an anagram of 'inthes'.
'inthes'+'tars'='IN THE STARS'

'it's' acts as a link.

Can you help me to learn more?