It's worth getting excited when you have a fling (5)
I believe the answer is:
throw
'have a fling' is the definition.
(I've seen this in another clue)
'it's worth getting excited when you' is the wordplay.
'worth' can be anagrammed to 'THROW'.
Though, I'm unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for throw that I've seen before include "Try not to win" , "Make a pot" , "A turn with the dice" , "pitch or > floor" , "Chuck - confuse" .)