It takes a turn for the better (8,5)
'it takes a' is the definition.
The definition suggests a singular noun which matches the answer.
'turn for the better' is the wordplay.
'turn' becomes 'wheel' (I've seen this before).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the better' becomes 'roulette' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'wheel' put after 'roulette' is 'ROULETTE-WHEEL'.
Can you help me to learn more?
(Another definition for roulette wheel that I've seen is " It spins in the casino".)
'better' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'it takes a turn for the' is the wordplay.
I cannot really see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
'turn' could be 'u' (a 'U-turn' is a kind of turn) and 'u' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for roulette that I've seen before include "SPORT/GAME" , "Casino game" , "it's for the better, supposedly" , "If Russian, it's a very dangerous game" , "Wheel of fortune" .)