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It takes a turn for the better (8,5)

Ross

I think it could be either:

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8

8,5

roulette wheel

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'the better' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'it takes a turn' is the wordplay.
'it' becomes 'roulette' (I am not sure about this - if you are sure you should believe this answer much more).
'takes' says to put letters next to each other.
'a turn' becomes 'wheel' (I've seen this before).
'roulette'+'wheel'='ROULETTE WHEEL'

'for' is the link.

Can you help me to learn more?

(Another definition for roulette wheel that I've seen is " It spins in the casino".)

I've seen this clue in The Globe and Mail.
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