It's worth having a change so have a fling (5)
I believe the answer is:
'have a fling' is the definition.
(I've seen this in another clue)
'it's worth having a change' is the wordplay.
'worth' can be anagrammed to 'THROW'.
But, I am unsure how the anagram is indicated.
'so' is the link.
Can you help me to learn more?
(Other definitions for throw that I've seen before include "Confuse - cast" , "Make a pot" , "Try to lose" , "Toss" , "Organise party" .)