Land ho! Welcome to Australia, the source of many fresh starts (9,3)
I believe the answer is:
groundhog day
'source of many fresh starts' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'land ho welcome to australia' is the wordplay.
I cannot really see how this works, but
'land' could be 'ground' (synonyms) and 'ground' is found in the answer.
'ho' is within the answer.
'australia' could be 'a' (abbreviation for Australia) and 'a' is found within the answer.
This explanation may well be incorrect...
'the' acts as a link.
Can you help me to learn more?
(Other definitions for groundhog day that I've seen before include "Situation in which events are continually repeated" , "Picture" .)