Worn out and heartbroken, took a bad turn again (10)
I believe the answer is:
threadbare
'worn out' is the definition.
(I've seen this before)
'took a bad turn again' is the wordplay.
'took' becomes 'thre' (I can't explain this - if you can you should believe this answer much more).
'turn' is an anagram indicator.
'again' becomes 're'.
'bad' with letters rearranged gives 'dba'.
'thre'+'a'+'dba'+'re'='THREADBARE'
'and heartbroken' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for threadbare that I've seen before include "deprived of nap" , "Thin, tattered, worn out" , "Has little nap" , "Well-worn" , "cliche-ridden" .)