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Hi I am stuck on these last few and would really appreciate anyhelp, can anyone figure out the below answers??

38. A first for Boss? (5) I_A_ _

56. A century before the heat will make sure you're breaking the rules (5) _ _ E_ _

57. The number 1 snub? (7) _ _U _ _ _ N

74. American racing series (1,1,1,1) _ _ _ C

63. With no return of serve, Andy Murrary would be expected to get one of these on a regular basis (3)
_C_

38 ahead ???
63 ace

Thanks.

74 IMSA
the International Motor Sports Association

???

56 cheat ???
C (entury) + heat

74 TORC

38 Isaac

https://en.wikipedia.org/wiki/Isaac_Boss

57 Cluxton

57 Google ' Cluxton snub and see what you think.
Very vague in my opinion.

Obviously 'Cluxton' is what I'm thinking.

Cluxton makes perfect sense and also confirms 74 torc

Thanks for your help and speedy replies, very good forum.

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