Put a ring in one's rearranged necktie (5)
I believe the answer is:
noose
'necktie' is the definition.
(I've seen this in another clue)
'put a ring in one's rearranged' is the wordplay.
'put a ring' becomes 'o' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' is an insertion indicator.
'rearranged' indicates anagramming the letters.
'ones' is an anagram of 'nose'.
'o' placed within 'nose' is 'NOOSE'.
Can you help me to learn more?
(Other definitions for noose that I've seen before include "Hanging loop in rope" , "Loop in a lariat" , "Catch" , "Scaffold rope" , "it could endanger your life" .)