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17D It'll do a concrete job out front or back ... if that's of any use to Americans? ( 4,5 )

?A?? ?R?S?

4D Let me do a number on you - just for you to hear about it. ( 4)
?O?R FOUR ????

I suppose "for" sounds like "four", to some folk?
17, This is only a hunch, because I can not parse it.
Yard brush?

Thanks Rusty - YARD occurred to me immediately due to American mention in clue. CONCRETE in the clue is confusing.
I will chance it as BRUSH can be used back & front I guess.